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