Full list of all 62 Duke Nukem Forever achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there is 1 DLC pack containing 12 achievements.
Kill 100 aliens
Kill 250 aliens
Foot stomp 12 aliens
Execute 20 aliens
Kill 10 aliens with Trip Mines
Kill 15 frozen aliens
Kill 15 aliens with the monster truck
Kill 6 aliens with the forklift
Kill 10 aliens with environmental explosives
Kill 10 aliens with tossed objects
Kill 15 aliens with melee attacks while on steroids
Kill 30 aliens with headshots
Drink beer while on steroids or vice-versa in SP
Get knocked down 10 times
Find 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
Win air hockey with a score of 7-0 in the strip club
Earn a 1,000,000 pinball score in SP
Use a Holoduke in SP
Discover all ego cap rewards
Carry the gold pistol through the whole SP campaign
Complete the SP campaign on Easy Difficulty
Complete 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
Find all 3 helmets in the SP campaign
Listen to all phone messages
Drink all of the beers in the strip club
Kill all of 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 Battlelord in Las Vegas
Defeat the Alien Queen
Defeat the Battlelord on the Hoover Dam
Defeat the Octaking
Defeat the Energy Leech
Kill 3 aliens at once
Kill 50 aliens
Take steroids in SP
Drink a beer in SP
Eat 10 pieces of food during the SP campaign
Defeat the Cycloid
Doodle something on the whiteboard in SP
Kill 10 expanded enemies with melee attacks
Kill 3 enemies within 3 seconds with the Impregnader
Let 20 enemies die by someone else's hand
Kill 30 enemies with the moon rover
Earn a 1,000,000 pinball score on the Scientits pinball machine
Finish Doctor Proton
Beat the DLC campaign on Easy Difficulty
Beat the DLC campaign on Normal Difficulty
Beat the DLC campaign on Hard Difficulty
Beat the DLC campaign on Expert Difficulty
Discover all Ego cap rewards in the DLC campaign
Discover and reject the video game that lets you slap women