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Defeat Mannoroth in Well of Eternity on Heroic Difficulty.

Defeat Peroth'arn in Well of Eternity on Heroic Difficulty without any party member being detected by an Eye of Peroth'arn.

Defeat Murozond in End Time on Heroic Difficulty.

Defeat C'Thun.

Defeat Ossirian the Unscarred.

Defeat Onyxia without anyone taking damage from a Deep Breath in 10-player mode.

Defeat Onyxia in less than 5 minutes in 10-player mode.

Defeat Onyxia in 10-player mode.

Obtain a Sinister Squashling pet and Hallowed Helm from the Hallow's end world events .

Obtain a Mask during Hallow's End.

Kill the Headless Horseman.

Complete the heroic Pandaria dungeon achievements listed below.

Defeat the Sha of Doubt in Temple of the Jade Serpent on Heroic difficulty.

Defeat the Sha of Doubt in Temple of the Jade Serpent.

Use the Dungeon Finder tool to finish random heroic dungeons until you have grouped with 50 random players total.