There are 51 Trophies that can be collected.

Bronze

Extermination
Kill 50 aliens.

Annihilation
Kill 100 aliens.

Nuclear Devastation
Kill 250 aliens.

On the Noggin'
Kill 30 aliens with headshots.

Hippy-Stomper 20
Foot stomp 12 aliens.

Judge, Jury, Executioner
Execute 20 aliens.

Trapper
Kill 10 aliens with Trip Mines.

Freeze Well!
Kill 15 frozen aliens.

Road Rage
Kill 15 aliens with the monster truck.

Fork the Pork
Kill 6 aliens with the forklift.

Dead Useful
Kill 10 aliens with environmental explosives.

Tosser… in the Literal Sense
Kill 10 aliens with tossed objects.

Duke Angry, Duke Smash!
Kill 15 aliens with melee attacks while on steroids.

Noms
Eat 10 pieces of food during the SP campaign.

Natural Disaster 3
Kill 3 aliens at once.

Full Body Tourettes
Get knocked down 10 times.

Turd Burglar
Find and steal a piece of poo.

I Need a Towel
Get hit by 10 Pregnator bombs.

Baron von Nukem
Shoot down 20 alien fighters.

Pescaphobe
Kill all of the catfish in the underwater level.

Drawrings
Doodle something on the whiteboard in SP.

I Need a Date
Look at every page of a calendar in SP.

Stick Bomb Like You!
Put a Trip Mine on a live alien.

Big Guns, Big Ships
Blow up 5 enemy Gunships or Dropships.

Flaggon of Chuckles
Drink a beer in SP.

Juiced
Take steroids in SP.

He's Got a Hologram!
Use a Holoduke in SP.

Substance Abuser
Drink while on steroids or vice versa in SP.

Sunday, Black Sunday
Shoot down the blimp above the stadium.

Nobody Likes a Whiner
Knock out the talent at the talk show.

Lots of Whacking
Win a game of Alien Abortion.

Companion Barrel
Unlock the secret closet at the end of the Forkstop.

One-Eyed Freak
Defeat the Cycloid.

Pit Champion
Defeat the Battlelord in Las Vegas.

Piece of Cake
Complete the SP campaign on Easy Difficulty.

Special Thanks
Watch the credits all the way through.

Silver

Call Waiting
Listen to all phone messages.

Bucker Head
Find all 3 helmets in the SP campaign.

Party Animal
Drink all of the beers in the strip club.

Air-Duke
Win air hockey with a score of 7-0 in the strip club.

Balls of Steel
Earn a 1,000,000 pinball score in SP.

I Am All That Is Man
Discover all Ego cap awards.

Gunslinger
Carry the gold pistol through the whole SP campaign.

Not Bad for a Human
Defeat the Alien Queen.

A Good Dam Fight
Defeat the Battlelord on the Hoover Dam.

Octacide
Defeat the Octaking.

Beating the One-Eyed Worm
Defeat the Leech.

Let's Rock
Complete the SP campaign on Normal Difficulty.

Gold

Come Get Some
Complete the SP campaign on Hard Difficulty.

Damn, I'm Good
Complete the SP campaign on Insane Difficulty.

Platinum

Savior of the Universe
You got them all!

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