WoWDB

Progress on this achievement is shared account wide.

Defeat every boss in Naxxramas in 25-player mode.

Criteria

• The Arachnid Quarter (25 player)
• The Construct Quarter (25 player)
• The Plague Quarter (25 player)
• The Military Quarter (25 player)
• Sapphiron's Demise (25 player)
• Kel'Thuzad's Defeat (25 player)