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Defeat C'Thun while in a guild group.

Defeat The Black Knight in the Trial of the Champion on Heroic Difficulty while in a guild group.

Complete the heroic Northrend dungeon achievements listed below while in a guild group.

Defeat Yogg-Saron without the assistance of any Keepers while in a guild group.

Defeat Algalon the Observer while in a guild group.

Defeat the Lich King on Heroic mode in Icecrown Citadel while in a guild group.

Defeat Kel'Thuzad in Naxxramas while killing at least 18 abominations in his chamber while in a guild group.

Defeat Halion on Heroic mode in The Ruby Sanctum while in a guild group.

With all three Twilight Drakes still alive, engage and defeat Sartharion the Onyx Guardian while in a guild group.

Defeat Deathwing in Dragon Soul on Heroic difficulty while in a guild group.

Defeat the bosses in Dragon Soul while in a guild group.

Defeat the bosses in Baradin Hold while in a guild group.

Defeat Anub'arak in the Trial of the Crusader on Heroic mode while in a guild group.

Defeat Ingvar the Plunderer on Heroic Difficulty while in a guild group.

Defeat King Ymiron on Heroic Difficulty while in a guild group.