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

Lazy Eye

Alizabal

Defeat Archbishop Benedictus in Hour of Twilight on Heroic Difficulty.

Defeat Mannoroth in Well of Eternity on Heroic Difficulty.

Use the Dungeon Finder tool to finish random heroic dungeons until you have grouped with 100 random players total.

Defeat Murozond in End Time on Heroic Difficulty.