The Molten Front Offensive

This achievement takes a while to get, possibly a little short of a month if you are completing each daily every day.

First Step: The Sanctuary Must Not Fall.
To complete this, doing the prequests is all that is required. You can get this part on the first day of quests. Completing this unlocks three dailies, two of which are obtained, one is triggered on the completion of both. All of these quests require you to go around Hyjal, mostly in the North and the West.

Second Step: Through the Gates of Hell.
To complete this, you must complete the quest that requires 20 marks of the world tree. Once completing that quest, you will be sent off on a journey that will eventually lead up to opening up the Molten Front, a new zone full of quests.

Step: The Shadow Wardens.
You can choose which of the two quests to complete. Both quests require 150 marks of the world tree. If you should choose The Shadow Wardens, you will obtain a new set of quests that can be completed after completing the previous quests. (What i mean here is that after completing the normal set of dailies, you can do these too).

Step: The Druids of the Talon.
To unlock this part of the achievement, you will need to complete the quest, The Druids of the Talon. It requires 150 marks of the world tree. As with the Shadow Wardens, you will obtain a new set of quests after unlocking the Shadow Wardens, that can be completed after doing your normal set of dailies.

NOTE: After unlocking both, you must choose which set of dailies you want to do, as both are now available.

Step: Little Lasher.
This part of the achievement is only able to be unlocked if you have allied the Shadow Wardens. Among the quests that they have to offer, a few will send you among the spiders to kill them, or whatever. In the north, there is a seed that has a QUEST (not daily) on it. The seed drops from killing one of the Druids of the Flame, and will appear right on top of a corpse. It isn't in the loot table, but completely separate. Check your mini-map to find it, because it may be difficult to locate as it is right on top of the corpse. You will have to take this seed to Avrilla, who is in Malfurion's Breach. After completing this quest, you will get a daily from the Lasher, adding 1 mark of the world tree to your daily sum. Simply turning in the seed quest will unlock this part of the achievement.

Step: Save Anren Shadowseeker.
This can only be unlocked if you have allied the Druids of the Talon. The set of quests that they have to offer you send you deep under the Molten Front. It is a massive cave/tunnel. There will be some quests down there for you to do. If you travel deep into said cave, you will find that there is a night elf that has been badly wounded amongst the rocks in the lava. Simply jump from rock to rock to talk to this elf (he has a quest over him, not a daily). Then you will have to escort him out of the tunnel. After escorting him, you will recieve another daily quest, adding 1 mark to your daily sum. But you only have to escort him to unlock that part of the achievement.

Step: Filling the Moonwell.
Step: Additional armaments.
Step: Calling the Ancients.
After completely unlocking BOTH the Druids of the Talon and the Shadow Wardens, three new quests pop up. Each quest requires 125 marks of the world tree. Simply completing each quest will unlock the achievement. Which one you want to do first is completely up to you.
Each of these quests also unlocks a vendor. The vendor sells 365 gear and patterns for various professions. You can see what each vendor has to sell before you unlock them, so check to see which vendor sells you the most valuable items.

This achievement is what you get after completing every quest, and rewards a unique mount. Since this achievement also TECHNICALLY rewards gear, raiders and such should explore the oppertunities, even if a mount isn't interesting.

He mails it to us? How exactly do you fit a flaming hippogryph into an envelope? The shipping cost must be ridiculous >.>

After earning this achievement, the player receives a letter from Malfurion Stormrage. The mount [item=69213] is attached to this mail, and is currently not purchasable from any vendor in or near the Firelands.

From: Malfurion Stormrage

Subject: A Gift from the Arch Druid

Never again will Hyjal shudder beneath the endless forces of flame. Never again shall the mortal races of the world tremble before the minions of Ragnaros.

Now, thanks to your efforts, they will tremble before US.

Your heroism on the Molten Front has been instrumental in the fight against the Firelord. You have gathered allies from all over Kalimdor and turned them into an army. You have fought the minions of Ragnaros... and prevailed. And for that, you have our deepest thanks.