Mogg-Saron

If you are 100% certain you meet the criteria for this achievement or any other Appearance achievement make sure the items in your bag cannot be sold back to the vendor. I had two pieces of 25 man Naxx and 3 pieces of Furious Gladiator in my bags which met the criteria for their respective achievements but the achievements didn't proc. I deleted the items from my bags and the achievements immediately proc'd. Any comments saying you need every item in your bag are outdated.

The 5 Piece, Tier 8 set from Ulduar is token based, shared across the classes. The class split was kept from Tier 6 with the addition of the then new Death Knight class:

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• Paladins, Priests and Warlocks share tokens of the wayward conqueror
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• Warriors, Hunters and Shaman share tokens of the wayward protector
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• Rogues, Mages, Druids and Death Knights share tokens of the wayward vanquisher
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10 man sets are labelled as Valorous while 25 man sets are labelled as Conquerors.

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• Headpiece tokens drop Mimiron (10) and Thorim (25)
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• Glove tokens drop from Freya (10) and Mimiron (25)
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• Leg tokens drop from Hodir (10) and Freya (25)
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• Shoulder tokens drop from Thorim (10) and Yogg-Saron (25)
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• Chest tokens drop from Yogg-Saron (10) and Hodir (25)
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Glove and leg tokens may also be dropped by Emalon The Storm Watcher

[class=1] - Protection - Conqueror's Siegebreaker Plate / Valorous Siegebreaker Plate
[class=1] - Arms / Fury - Conqueror's Siegebreaker Battlegear / Valorous Siegebreaker Battlegear
[class=2] - Protection - Conqueror's Aegis Plate / Valorous Aegis Plate
[class=2] - Retribution - Conqueror's Aegis Battlegear / Valorous Aegis Battlegear
[class=2] - Holy - Conqueror's Aegis Reglia / Valorous Aegis Regalia
[class=7] - Enhancement - Conqueror's Worldbreaker Battlegear / Valorous Worldbreaker Battlegear
[class=7] - Restoration - Conqueror's Worldbreaker Regalia / Valorous Worldbreaker Regalia
[class=7] - Elemental - Conqueror's Worldbreaker Garb / Valorous Worldbreaker Garb
[class=3] - All specs - Conqueror's Scourgestalker Battlegear / Valorous Scourgestalker Battlegear
[class=4] - All specs - Conqueror's Terrorblade Battlegear / Valorous Terrorblade Battlegear
[class=11] - Feral - Conqueror's Nightsong Battlegear / Valorous Nightsong Battlegear
[class=11] - Restoration - Conqueror's Nightsong Regalia / Valorous Nightsong Regalia
[class=11] - Balance - Conqueror's Nightsong Garb / Valorous Nightsong Garb
[class=9] - All specs - Conqueror's Deathbringer Garb / Valorous Deathbringer Garb
[class=5] - Disc / Holy - Conqueror's Sanctification Regalia / Valorous Sanctification Regalia
[class=5] - Shadow - Conqueror's Sanctification Garb / Valorous Sanctification Garb
[class=8] - All specs - Conqueror's Kirin Tor Garb / Valorous Kirin Dor Garb

As of 7.2, tokens can be clicked to automatically create the item based on your loot specialization, bypassing the need to visit a tier vendor.

Tokens "of the Wayward" can be turned in for Tier 8 PvE sets. There are 10- and 25-man versions of these sets.

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• Turn-in will vary based on class/armor proficiency, but all turn-ins will be in Northrend's version of Dalaran.
  - Plate will be at the BS, cloth at Threads of Fate, etc.
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• Some tokens can be purchased at Horde/Alliance vendors with gold (details below).
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Tokens are separated by class into 3 groups (this tier is not available for monks or demon hunters):

• Conqueror: Paladin / Priest / Warlock
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• Protector: Warrior / Hunter / Shaman
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• Vanquisher: Rogue / Death Knight / Mage / Druid
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All tokens drop in [zone=4273].

10m (219 ilvl)

25m (226 ilvl)

Helm

[npc=33350]
[item=45647]
[item=45648]
[item=45649]

[npc=32865]
[item=45638]
[item=45639]
[item=45640]
or buy token from vendor (A | H).

Shoulders

[npc=32865]
[item=45659]
[item=45660]
[item=45661]

[npc=33288]
[item=45656]
[item=45657]
[item=45658]

Chest

[npc=33288]
[item=45635]
[item=45636]
[item=45637]

[npc=32845]
[item=45632]
[item=45633]
[item=45634]
or buy token from vendor (A | H).

Gloves

Freya
[item=45644]
[item=45645]
[item=45646]

[npc=33350]
[item=45641]
[item=45642]
[item=45643]

Legs

[npc=32845]
[item=45650]
[item=45651]
[item=45652]

Freya
[item=45653]
[item=45654]
[item=45655]

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• [npc=33993], one of the bosses in [zone=4603], can drop glove and leg Tier 8 PvE pieces. These are post-token pieces - so instead of [item=45650], he would drop [item=45379].
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• A completed set of either difficulty will reward this achievement (please comment if this does not carry over from ptr to live). Lookalike sets will not.
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Criteria of the meta Azeroth's Next Top Model, wowhead wrote up a full guide for the pve sets here.