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Defeat the Assembly of Iron in Ulduar with Steelbreaker as the last member alive.

Defeat the Assembly of Iron with Steelbreaker as the last member alive in 25-player mode.

Defeat XT-002 Deconstructor in Ulduar after destroying his heart.

Defeat XT-002 Deconstructor after destroying his heart in 25-player mode.

Complete the 10-player raid achievements listed below.

Enter every portal spawned by Valithria Dreamwalker before healing her to full health in 10-player mode.

Allow Necrotic Plague to stack to 30 before defeating the Lich King in 10-player mode.

Defeat the bosses of The Frostwing Halls in Icecrown Citadel in 10-player Heroic mode.

Defeat every boss in Icecrown Citadel in 10-player mode.

Defeat the bosses of The Frostwing Halls in Icecrown Citadel in 10-player mode.

Defeat the bosses of The Crimson Hall in Icecrown Citadel in 10-player Heroic mode.

Defeat the bosses of The Plagueworks in Icecrown Citadel in 10-player Heroic mode.

Defeat the first four bosses in Icecrown Citadel in 10-player Heroic mode.

Defeat Lady Deathwhisper with at least five different types of Cultists active at the time of her demise in 10-player mode.

Defeat C'Thun.