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