Defeat Onyxia in 25-player mode.

Kill Maexxna in Naxxramas within 20 minutes of Anub'Rekhan's death in 25-player mode.

Defeat the bosses of The Military Quarter of Naxxramas in 25-player mode.

With all three Twilight Drakes still alive, engage and defeat Sartharion the Onyx Guardian in 25-player mode.

Defeat Sartharion the Onyx Guardian and the Twilight Drakes with fewer than 21 players in 25-player mode.

Defeat Sapphiron in Naxxramas in 25-player mode.

Defeat Onyxia in less than 5 minutes in 25-player mode.

Defeat Thaddius in Naxxramas with less than 21 players in 25-player mode.

Kill Patchwerk in Naxxramas in 3 minutes or less in 25-player mode.

Defeat Loatheb in Naxxramas without killing any spores in 25-player mode.

Defeat the bosses of The Arachnid Quarter of Naxxramas in 25-player mode.

Defeat Heigan the Unclean in Naxxramas without anyone in the raid dying in 25-player mode.

Defeat Malygos in 25-player mode.

Defeat Kel'Thuzad in Naxxramas while killing at least 18 abominations in his chamber in 25-player mode.

Defeat Malygos in 6 minutes or less in 25-player mode.

Defeat Thaddius in Naxxramas without anyone in the raid crossing the negative and positive charges in 25 player mode.

Defeat Sartharion the Onyx Guardian in 25-player mode.

Defeat Sartharion the Onyx Guardian without getting hit by Lava Strike in 25-player mode.

Defeat Malygos with fewer than 21 in 25-player mode.

With at least one Twilight Drake still alive, engage and defeat Sartharion the Onyx Guardian in 25-player mode.

Defeat the bosses of Naxxramas with less than 21 people in the zone in 25-player mode.

Defeat the bosses of The Plague Quarter of Naxxramas in 25-player mode.

Defeat Onyxia without anyone taking damage from a Deep Breath in 25-player mode.

Defeat Sapphiron in Naxxramas without any member of the raid having a frost resist value over 100 in 25-player mode.

Defeat Kel'Thuzad in Naxxramas in 25-player mode.

Cause 50 Onyxia Whelplings to hatch within 10 seconds of Onyxia's liftoff, and then defeat her in 25-player mode.

Defeat the bosses of The Construct Quarter of Naxxramas in 25-player mode.

Defeat Grand Widow Faerlina in Naxxramas without dispelling or preventing frenzy in 25-player mode.

Within one raid lockout period, defeat every boss in Naxxramas without allowing any raid member to die during any of the boss encounters in 25-player mode.

Defeat the 4 Horsemen in Naxxramas, ensuring that they all die within 15 seconds of each other in 25-player mode.

With at least two Twilight Drakes still alive, engage and defeat Sartharion the Onyx Guardian in 25-player mode.

Defeat every boss in Naxxramas in 25-player mode.

Deliver a killing blow to a Scion of Eternity while riding on a hover disk in 25-player mode.