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Defeat Algalon the Observer in 25-player mode.

Complete the Ulduar raid achievements listed below.

Defeat Mimiron in Ulduar after activating his Self-Destruct mechanism.

Defeat the Keeper bosses of Ulduar.

Defeat Mimiron after activating his Self-Destruct mechanism in 25-player mode.

Defeat the Keeper bosses of Ulduar in 25-player mode.

Defeat Hodir in Ulduar before he shatters his Rare Cache of Winter.

Defeat Hodir in Ulduar without any raid member ever gaining more than 2 stacks of Biting Cold.

Defeat Hodir in Ulduar without any raid member being hit by Flash Freeze.

Defeat Hodir before he shatters his rare cache in 25-player mode.

Defeat Hodir without any raid member having more than 2 stacks of Biting Cold in 25-player mode.

Defeat Hodir without any raid member being hit by Flash Freeze in 25-player mode.

Defeat Thorim in Ulduar while Sif is present.

While fighting Thorim in Ulduar, force him into the arena before Sif departs.

When fighting Thorim in Ulduar, participate in killing the Ancient Rune Giant and the Runic Colossus.