Get at least 4 kills with XCOM Base Security personnel

Kill a Muton Berserker in melee combat in single player

Eliminate an enemy's shield and kill it on the same turn in single player

Modify a soldier in single player

Stop a squad member from suffocating in single player

You defeated 20 enemies using Cartman's Ass.

You completed the game and never ended a battle with your buddy knocked out.

You defeated the High Jew Elf Kyle in battle.

You defeated the Boss Hall Monitor while wearing freckles.

You've farted on every buddy in the game.

You farted on the corpse of an aborted Nazi Zombie fetus.

Get a 12 hit combo