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SEPTIC TANK

Use a bile bomb on a Tank.

SEPTIC TANK0
4 guidesOnline/Offline - These achievements can be obtained in either an online or offline game mode.Single Player - These achievements can be obtained by a single player.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.
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A bile bomb is the boomer vomit that is in a vile, usually dropped by CEDA Hazmat on the campaign Dead Center.
When you have a bile bomb, select it and throw it either at the tank. This achievement will unlock if the tank turns purple, meaning that he has the vomit on him.