The Sacrifice DLC Achievements

Barrel Rolled (50G) Kill a Special Infected with an exploding barrel.

Chaos Generator (50G) Have all 3 generators running at once in "The Sacrifice" finale.

Kill Bill (50G) Have Bill sacrifice himself for the team.

Sacrifizzle (50G) As a Special Infected, incap someone who is trying to sacrifice themselves.

Supreme Sacrifice (50G) Complete "The Sacrifice".