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