Blizzard released a new update to the PTR 3.3: The Frozen Halls. The build 10571 added some class changes and introduced the 10-player mode achievements for the Icecrown Citadel dungeon. The 25-player mode achievements are still missing in this build.
Fall of the Lich King (10 player) Achievements
Storming the Citadel
Defeat the first four bosses in Icecrown Citadel in 10-player mode.
- Lord Marrowgar
- The Deathbringer
- Claim victory in the Gunship Battle
- Lady Deathwhisper
The Frostwing Halls
Defeat the bosses of the Frostwing Halls in Icecrown Citadel in 10-player mode.
- Rescue Valithiria Dreamwalker
- Professor Putricide
The Crimson Hall
Defeat the bosses of the Crimson Hall in Icecrown Citadel in 10-player mode.
- Defeat the Blood Prince Council
- Queen Lana’thel
The Frozen Throne
Defeat the Lich King in Icecrown Citadel in 10-player mode.
- The Lich King
Fall of the Lich King
Defeat every boss in Icecrown Citadel in 10—player mode.
- Storming the Citadel
- The Frostwing Halls
- The Crimson Hall
- The Frozen Throne
- The Plagueworks
It’s a Trap!
Survive the Ice Jets in Icecrown Citadel 10-player mode.
Defeat Lord Marrowgar without anyone taking damage from Bone Cyclone in 10-player mode.
Defeat X of Lady Deathwhisper’s adds with her bombs and then defeat Lady Deathwhisper in 10-player mode.
I’m on a Boat
Claim victory in the Gunship Battle in which every raid member visits the enemy gunship only once in 10-player mode.
I’ve Gone and Made a Mess
Defeat the Deathbringer with fewer than X raid members suffering from Garrote in 10-player mode.
Dances with Oozes
Defeat Rotface without exploding any oozes in 10-player mode.
Once Bitten, Twice Shy
Defeat the Blood Queen while having been a vampire in 10-player mode.