The Safety Dance (25 player)

The Safety Dance (25 player) is a dungeon & raids achievement earned for defeating Heigan the Unclean in Naxxramas on 25-player mode without anyone in the raid dying.

Strategy
The only difficulty in this achievement is having all the members of the raid being able to move across the floor in the second phase without getting hit by the waves and dying as a result. Now that the safe spot has been fixed, the only way to do this fight is simply by having everyone in the raid successfully dance through the lava stages. Since Heigan puts out such low damage and has no enrage timer, you may find it easiest to do this achievement with a reduced-size raid.

Trivia

 * The name of this achievement is based on the song "The Safety Dance" by Men Without Hats.