Kill 50 aliens
Annihilation
40Kill 100 aliens
Kill 250 aliens
Foot stomp 12 aliens
Execute 20 aliens
Trapper
20Kill 10 aliens with Trip Mines
Freeze Well!
20Kill 15 frozen aliens
Road Rage
20Kill 15 aliens with the monster truck
Kill 6 aliens with the forklift
Dead Useful
15Kill 10 aliens with environmental explosives
Kill 10 aliens with tossed objects
Kill 15 aliens with melee attacks while on steroids
Noms
10Eat 10 pieces of food during the SP campaign
Kill 30 aliens with headshots
Kill 3 aliens at once
FBT
10Get knocked down 10 times
Turd Burglar
10Find and steal a piece of poo
Get hit by 10 Pregnator bombs
Shoot down 20 alien fighters
Look at every page of a calendar in SP
Put a Trip Mine on a live alien
Blow up 5 enemy gunships or dropships
Air-Duke
30Win air hockey with a score of 7-0 in the strip club
Earn a 1,000,000 pinball score in SP
Drink a beer in SP
Juiced
5Take steroids in SP
Use a Holoduke in SP
Drawrings
10Doodle something on the whiteboard in SP
Drink beer while on steroids or vice versa in SP
Discover all Ego cap awards
Gunslinger
50Carry the gold pistol through the whole SP campaign
Complete the SP campaign on Easy Difficulty
Let's Rock
30Complete the SP campaign on Normal Difficulty
Complete the SP campaign on Hard Difficulty
Complete the SP campaign on Insane Difficulty
Watch the credits all the way through
Bucket Head
30Find all 3 helmets in the SP campaign
Call Waiting
25Listen to all phone messages
Party Animal
10Drink all of the beers in the strip club
Pescaphobe
10Kill all the catfish in the underwater level
Shoot down the blimp above the stadium
Knock out the talent at the talk show
Win a game of Alien Abortion in the strip club
Unlock the secret closet at the end of the Forkstop
Defeat the Cycloid
Pit Champion
25Defeat the Battlelord in Las Vegas
Defeat the Alien Queen
Defeat the Battlelord on the Hoover Dam
Octacide
25Defeat the Octaking
Defeat the Energy Leech