1. Left 4 Dead
  2. Chaos Generator
  3. Guide by Yazite

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Left 4 Dead

Left 4 Dead

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Left 4 Dead
Chaos Generator

Have all 3 generators running at once in "The Sacrifice" finale.

Chaos Generator0
1 guideOnline/Offline - These achievements can be obtained in either an online or offline game mode.Cooperative - These achievements can be obtained by two or more players in a cooperative game mode who have met the achievement requirements.Versus - These achievements can be obtained by two or more players in a face off gamemode who have met the achievement requirements.3 Players Required - These achievements require a minimum number of participating players to attempt.
YaziteYazite58,278
Locked 08 May 2016
1 0 0
The description is very misleading.

What you need to do is activate the generators at the EXACT SAME TIME. Therefore, you'll need two other players to help you out. Using voice chat will be highly beneficial. If you don't have voice chat, you could use the Pipe Bomb explosion as the signal.