The The Doctor Who Cloned Me Add-on for Duke Nukem Forever has 12 achievements.
Beat the DLC campaign on Normal Difficulty
Beat the DLC campaign on Hard Difficulty
Beat the DLC campaign on Expert Difficulty
Beat the DLC campaign on Easy Difficulty
Kill 30 enemies with the moon rover
Discover all Ego cap rewards in the DLC campaign
Earn a 1,000,000 pinball score on the Scientits pinball machine
Discover and reject the video game that lets you slap women
Let 20 enemies die by someone else's hand
Finish Doctor Proton
Kill 3 enemies within 3 seconds with the Impregnader
Kill 10 expanded enemies with melee attacks