The Plague Quarter (25 player) is a dungeon & raids achievement earned for defeating all the bosses in the Plague Quarter of Naxxramas on 25-player mode.
See also[]
Patch changes[]
Patch 3.2.0 (2009-08-04): Renamed from Heroic: The Plague Quarter to The Plague Quarter (25 player).
Patch 3.0.2 (2008-10-14): Added.