Glory of the Ulduar Raider (25 player)

OK, Heres a nice list of what to do on each boss:

Flame Leviathan: (HARD MODE)
Engage of Flame Leviathan with all 4 orbital defence systems active. you do this by either talking to the Lore Keeper of Norgannon and keeping the 4 named towers alive, or talking to [/url=http://www.wowhead.com/?npc=33579]Brann and destroying the 4 towers. Keeping these towers alive dramatically increasers the bosses health and gives it 4 new, powerful skills.

Ignis the Furnace Master:
Kill him in four minutes. This is purely a DPS requirement, and quite a strict one when you also consider construct kiting, not casting on Flame Jets, etc.

Razorscale:
Kill 50 of the adds using the bosses Flame Breath, which she casts near the end of each landing and also during her ground phase. This is cumulative, so just a matter of time.

XT-002 Deconstructor: (HARD MODE)
Nuke the XT-002 down to 75%, then fully destroy the explosed heart. This will heal it to full, and grant it 40% additional health, 30% additional damage, and new spells.

Iron Council/Assembly of Iron: (HARD MODE)
Kill Steelbreaker last. This is the most difficult kill order, as Steelbreaker has a DPS requirement as he blows up raid members and gains damage on each death, as well as dealing serious melee damage.

Kologarn:
Kill both his arms within 10 seconds of each other. When this happens, you will have a large number of adds of you and the boss will start spamming damage to the whole raid, HOWEVER if the second arm death kills him you will NOT get the achievement. Thus, the best way is to kill both arms at 31%, then nuke down his last few health.

Auriaya:
This involves keeping her 4 adds alive. They gain increased damage as they group up, killing tanks in seconds if all 4 are together, and bimbined with fears and sonic screech this can be very difficult.

Thorim: (HARD MODE)
First, the 'tunnel group' must get to Thorim in under 3 minutes or Sif will despawn (this alone will get one achievement, but not the right one). This will make Sif fight you with Thorim - this gives Thorim 33% extra damage and 43% extra health. Sif is unkillable and uses powerful frost AOEs, making surviving much more difficult.

Freya: (HARD MODE)
Defeat her while all 3 of her 'Elder' minibosses are alive. They do not join in as with Sarth, but instead buff Freya andher adds, making them even more powerful!

Hodir: (HARD MODE)
Kill Hodir in 3 minutes, out of his 9 minute timer. This involves heavy raid DPS and efficient use of the buffing adds in order to reach the requirement.

Mimiron: (HARD MODE)
This means to press the big 'DO NOT PUSH' button behind Mimiron prior to engaging him. This adds an 8 minute enrage timer, 25% extra damage and health to each part, and extra skills to the already skill-laden 'don't stand in the fire' boss.

General Vezax: (HARD MODE)
Firstly, the raid must kill NO Saronite Crystals - which means no vapour, which means no mana regen. Eventually, 8 will be active, which will merge into the Saronite Animus. This makes the boss himself immune to all damage, and startstacking a debuff on the raid which deals shadow damage and increases shadow damage taken, giving this add a DPS requirement (from your mana-starved mana users and slowed melee). The boss must continue to be inturrupted while the Animus dies, as he continues using all his spells.

Yogg-Saron: (Almost HARD MODE)
The TRUE hard mode is 0 watchers, but this was considered too hard core for this meta and simply awards a title for the realm first. Each of the adds buffs the raid, improving damage and healing,speed,health or damage desistance (depending on the add) and giving a bonus such as killing immortal adds or regaining the raid sanity. Choose wisely - more information on each watcher is available on the actual ach page.

Algalon: (He feeds on your tears)
Nothing, you don't need to fight The Raid Destroyer - although you'll unlock him doing this meta!

NOTE: Not all achievements available in Ulduar are in the meta achievement for Glory of the Ulduar raider which is completely different from the previous Glory of the Raider making it slightly easier. A lot less luck based (Gonna go when the volcano blows) and less reliant on roles (Denyin' the Scion),and a lot less frustrating (Immortal).

Remember that achievements are obvious time sinks, so expect this to take at least a good portion of the time learning how to perform the fight with these gimmicks and thus awarded with a proto-drake. I can't comment on the difficulty of this GotR compared to the old one, but because if you and your raid want the reward, you can get it in time and not get penalized for things like doing the raid with less people.

One thing is guaranteed though, if achievements were never implemented - running the same raid over and over again the same way for the new couple of months waiting for 3.2 might get boring.

Below is "my" version of doing these achievements, there are possibly more ways to do the achievement, as merely I am trying to give you an idea of how and what to expect.

Difficulty rating [1 - being damn hard (Undying), 5 - being damn easy (Hundred Club)]

Difficulty rating: [1] : Orbit-uary - [Flame Leviathan]

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• Keeping any of the 4 Towers up during the gauntlet to FL starts hard-mode of the boss and changes the dynamics of the fight. Each tower (orbital defense) grants FL an extra ability your raid needs to deal with and 50% more life per tower
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• Leaving Tower of Storms up, blue pillars spawn randomly in the room and you will take damage if you run in them and more if you were directly under it.
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• Leaving Tower of Frost up, causes random ice tombs if you are near the impact of the ice, flame abilities can break it, otherwise you will be stunned for a minute.
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• Leaving Tower of Flames up, causes FL to have an "aoe" hellfire with a trail of fire behind.
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• Leaving Tower of Nature up, causes FL to spawn adds from corners of the room and occasionally summon Nature guardians during the fight in the middle of him.
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• Your health is fixed, you will not be able to heal your vehicles.
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• Remember to repair your vehicles before you engage.
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• Because this is vehicle fight and the only variable is STAMINA (as stated by a blue(linkplease) the higher the ilvl your items equipped with, the more hp your tank will have) meaning no matter how good your other weapons are, your damage is relatively fixed. It should be noted, offhand/relic/shirt/tabard slots are not affected.
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• Therefore, even as gear levels improve, proper execution and knowing what each of your vehicles does is the single most important tool in completing this achievement, don't expect to this with blues or greens the difference between ilvl213 to ilvl226 for every slot can give you up to 200k more hp.
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Difficulty rating: [3]: Stokin' the Furnace - [Ignis the Furnace Master]

• Remember You Don't Have an Eternity?, same idea, the need to stack buffs, flasks etc. will make this achievement more easier then bringing randoms to complete it.
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• Otherwise, as your gear levels improve, this becomes easier and easier.
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• As for raid comp goes, 1 will need to tank Ignis, 1 for the constructs that spawn and others as you see fit, but those would be the absolute minimum because the off tank holding the constructs will need to "drag" them into water so they aren't "fire" enraged (think lava elementals in OS)
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• 10 man harder then 25 man simply because of the raid buff stacking problem as you recall in You Don't Have an Eternity and the readily extra available OTsif the main - OT is Slag Pot'd - reminds you of Frost Blast from KT.
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Difficulty rating: [1] : I Choose You, Steelbreaker - [Iron Council]

• I hope you enjoyed Sartharion /w 3 drakes, because here it comes again in a new form but completely different in abilities and damage based on who you kill first and second. Remember in OS, you would kill Tenebron -> Shadron -> Vesperon and that the drakes don't get any buff from killing any of the drakes but Sartharion does. The catch here is you can choose to kill either Runemaster Molgeim or Stormcaller Brundir - there are achievements for leaving one of these two up last but this is considered the hardest of the 3.
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• Because this achievement is for leaving SB last, I will only explain what happens if you kill either Runemaster or Stormcaller first and ultimately what to expect and compare it to either leaving the other 2 last in terms of damage/raid awareness etc.
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• With all 3 of the dwarves up, SB himself has Fusion Punch and the High Voltage aura, also if he is hit with a Rune of Power by Molgeim, he hits for much harder.
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• If you choose to kill Molgeim first, you don't have to worry about SB getting runes, but you also don't get the buff associated from the rune if friendlies were to stand in it.
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• If you choose to kill Brundir first, you don't have to worry about interrupts on his Chain Lightning.
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• As soon as your raid kills one of the Iron Council members, SB will gain Static Disruption which is pretty much like a void zone + 75% increase in nature damage debuff except lasts longer. Leaving Brundir up with Steelbreaker means missing an interrupt on Brundir could be fatal and leaving Molgeim up with SB means Fusion Punches will hit for a crapton if the tank stands within a Static Disruption, up to this point this is pretty much avoidable but could gimp you if you aren't awake.
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• Next you have either Brundir OR Molgeim left to kill to qualify for the achievement, once the 2nd dwarf is killed, get ready to hold onto your hats!
  SB gains 2 more abilities which is equivalent to an enrage timer. The first one is Overwhelming Power, which is similar to Burning Adrenaline from Vael for those that remember. He casts this on the Main Tank or whoever is on top of the aggro list meaning, if you pull aggro you will get this buff. The second ability he gains is Electrical Charge for EVERY member that dies.
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• Now, this means at a certain point people will be dropping like flies faster then you can count by twos and tie your shoes. Along with his Lightning damage aura, Fusion Punch, Static Disruption - you will be in a world of hurt. You can not have more then 2 people to die during this time or it is impossible to bear once 2 dwarves are dead, he heals per raid death (20%) and can be affected by MS-type effects. The raid damage taken is insane, as you can see once any of these inconvenience happens, it goes down hill.
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• Remember that killing any dwarf heals the others to full regardless if you are doing the achievement or not.
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• To condense the above into a few words - kill Brundir 1st and Molgeim 2nd and prepare for tank cooldowns and lots of raid damage.
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Difficulty rating: [4] : Getting Cold in Here - [Hodir]

• This isn't as mindless as Keristrasza's version in Nexus, although equally as easy to get rid of. However, you will need everyone to not allow the stacks to accumulate or you will fail the achievement and that alone makes it hard
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• If anyone lags, you will probably fail, if anyone disconnects you will probably fail.
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• There are two ways for to get rid of the debuff. 1 - Simply move or 2 - Stand in a Toasty fire given by the Mage NPCs (they prevent biting cold from accumulating but disappear if snow or powerful frost magic hit them so be warned)
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• He has a 9-minute enrage timer, so factor in the time you have to dodge Flash Freeze and Icicles and casters requiring to stand to cast to complete this achievement.
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Difficulty rating: : Knock, Knock, Knock on Wood - [Freya]

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• Mortal strike type effects will help you deal with the bonus healing that Freya will be receiving from her adds.
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Difficulty rating: [3] : Crazy Cat Lady - [Auriaya]

• 2 (4 on heroic) Sanctum sentries exist at the beginning of the fight.
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• The sentries' pounce deals approx 5.5 - 8.6k depending on normal and heroic mode, since this achievement is to keep them alive, you will need possible 1-2 offtanks to take care of the sentries.
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• The sentry does a stacking dot debuff that increases in damage taken from the Sentries' rip attack the longer they are tanked, the debuff lasts for 20 seconds and can tick for large amounts.
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Difficulty rating: [3] : Lose Your Illusion - [Thorim]

• During the Thorim fight, a group will need to go through the gauntlet and reach Thorim within 3 minutes of starting the fight. You have 5 minutes to reach him before he kills the raid, but you must reach him in 3 minutes to engage hard mode and this achievement.
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• Upon reaching him, Sif, the woman beside her will assist Thorim in the fight by shooting crap at you that you will have to deal with during the fight.
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• The abilities Sif have include, Frostbolt, Frost Nova and Frostbolt Volley. The damage is approx 8-16k for both abilities and can be resisted.
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• Because Thorim has a stacking buff on himself, you will need to kill him quickly before he starts to one-two shot your tank.
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• Ideally, 2 healer, 2 tank, 6 dps should be your group make up.

Difficulty rating: [3] : Heartbreaker- [XT-002 Deconstructor]

• Every 25%, XT-002 exposes his heart that takes 100% extra damage, in order for this achievement to be accomplished, you will need to first kill his heart which is exposed for the first time @ 75%
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• Since there is an enrage timer along with a timer on how long the heart is exposed, a certain amount of dps is required from the raid in order to even access the hard mode.
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• If your group successful kills the heart, hard mode is engaged, XT-002 fully regains his hp and will have more base hp and damage and then it becomes a dps race along with the other mechanics of the fight and there you have it.
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• Gravity Bombs spawn Void Zones and Light Bombs spawn Life Sparks that must be killed.

Difficulty rating: [4] : Disarmed - [Kologarn]

• Kologarn has two arms, one that grabs raid members [Right] (1 on normal, up to 3 on heroic) and the other one does a shockwave.
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• He doesn't release your buddies until the arm sustains a portion of damage, (80k (10) - 380k (25) - (100k(10), 400k(25) until 3.1.2 is live) and will release your friends.
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• Killing one of the arms causes Kologarn to take 15% body damage.
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• Consistently kill his right arm until his life is about 35%, lower both him and his arms to a manageable level and kill.
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• You are allowed to kill the arms multiple times during the fight, but both of them need to have died within 12 seconds of his death for eligibility of this achievement, aka. HE MUST HAVE DIED WITH NO ARMS UP AND THE ARMS NEEDS TO HAVE DIED WITHIN 12 SECONDS OF EACH OTHER.
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• He does not have a hard mode, achievements for Kologarn are just mere options in how you can kill Kologarn
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Difficulty rating: [5] : Iron Dwarf, Medium Rare - [Razorscale]

• This achievement is only possible when Razorscale is grounded (<50%)
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• This achievement is cumulative and can be done in multiple attempts or multiple visits, the adds that spawn during the Razorscale encounter can be killed by her flame breath if you drag the adds in front of her where she can breathe on them.
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• Allow her to breath and kill 25 of them and the achievement is yours

Difficulty rating: [2] : I Love the Smell of Saronite in the Morning- [General Vezax]

• General Vezax's fight involves 0 mana regeneration exclu. Enh. Shaman and Ret. Pal, to regenerate mana during the fight, you must stand in the green clouds that spawn after destroying a "Saronite Vapor" during the fight. Standing in these vapors exchanges hp for mana.
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• For this achievement, you must not destroy any of these Saronite Vapors and allow for Saronite Animus to spawn, like the adds beside General Vezax, this mob causes the host to be immune to all sources of damage. Saronite Animus also does a stacking shadow damage debuff and must be killed to resume to the fight normally.
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• This achievement needs your healers to be really mana-efficient, channeling large heals and cancelling them if they might overheal. Quickly dispatch the Animus when it spawns after the 8th vapor appears and resume the fight normally.

Difficulty rating: [1] : One Light in the Darkness - [Yogg-Saron]

• You have a maximum of 4 Keepers to utlize during the fight of Yogg-Saron, for the achievement you are allowed a maximum of 1 keeper. This would be considered a mid-point in terms of hard mode for the Yogg-Saron fight. Judging by the wording of the achievement, I believe you can even do it with 0 keepers up, although I think that would be freakin' mad.
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  I am currently researching myself how and what the boss fights are like.