Extermination
Kill 50 aliens
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Annihilation
Kill 100 aliens
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Nuclear Devastation
Kill 250 aliens
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Hippy-Stomper
Foot stomp 12 aliens
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Judge, Jury, Executioner
Execute 20 aliens
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Trapper
Kill 10 aliens with Trip Mines
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Freeze Well!
Kill 15 frozen aliens
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Road Rage
Kill 15 aliens with the monster truck
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Fork the Pork
Kill 6 aliens with the forklift
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Dead Useful
Kill 10 aliens with environmental explosives
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Tosser... in the Literal Sense
Kill 10 aliens with tossed objects
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Duke Angry, Duke Smash!
Kill 15 aliens with melee attacks while on steroids
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Noms
Eat 10 pieces of food during the SP campaign
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On the Noggin'
Kill 30 aliens with headshots
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Substance Abuser
Drink beer while on steroids or vice-versa in SP
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Natural Disaster 3x
Kill 3 aliens at once
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