Here is the full list of all 19 Angry Video Game Nerd II: ASSimilation achievements.
Beat Old School difficulty
Collected every cartridge in the game!
Dropped 100 F-Bombs
Defeated Death Mwauthzyx
Completed the sexforce
Found the cape
Found all the armor
Found the Uber Scope
Found the Turbo Pad
Collected all cartridges in a world
Found the Swear'n'Scout
Defeated Board James
Collected all cartridges in a level
Found the Glove of Power
Perfected a stage (No deaths!)
Endured the tutorial
Perfected all stages
Beat Hard as Balls difficulty
Beat F***ing Impossible difficulty