The Spellweaver's Downfall (10 player)
Defeat Malygos in 10-player mode.
10
Disarmed (25 player)
Destroy both of Kologarn's arms and then Kologarn himself within 12 seconds in 25-player mode.
10
I Choose You, Stormcaller Brundir (25 player)
Defeat the Assembly of Iron with Stormcaller Brundir as the last member alive in 25-player mode.
10
Nerf Gravity Bombs (25 player)
Defeat XT-002 Deconstructor without any raid member dying from a Gravity Bomb in 25-player mode.
10
The Siege of Ulduar (25 player)
Defeat the bosses of The Siege area of Ulduar in 25-player mode.
10
A Quick Shave (25 player)
Defeat Razorscale without allowing her to fly into the air more than once in 25-player mode.
10
Hot Pocket (25 player)
Survive being thrown into Ignis the Furnace Master's Slag Pot in 25-player mode.
10
Shutout (25 player)
Defeat Flame Leviathan without causing a System Shutdown in 25-player mode.
10
Kel'Thuzad's Defeat (10 player)
Defeat Kel'Thuzad in Naxxramas in 10-player mode.
10
The Hundred Club (10 player)
Defeat Sapphiron in Naxxramas without any member of the raid having a frost resist value over 100 in 10-player mode.
10
Sapphiron's Demise (10 player)
Defeat Sapphiron in Naxxramas in 10-player mode.
10
The Spellweaver's Downfall (25 player)
Defeat Malygos in 25-player mode.
25
Kel'Thuzad's Defeat (25 player)
Defeat Kel'Thuzad in Naxxramas in 25-player mode.
10
Sapphiron's Demise (25 player)
Defeat Sapphiron in Naxxramas in 25-player mode.
10