Here is the full list of all 19 Angry Video Game Nerd Adventures achievements.
Beat the game on "Old School" or higher
Collect 200 1ups
Beat the game on "Normal" or higher
Beat the game over Halloween weekend on Normal or Higher difficulty
Enter a cheat code
Die 1000 times
Find all S*** Pickles
Find all the cameos
Find Craig
Find all playable characters
Kill Naggi
Ride the Fire shark
Kill Santa
Drink 100 beers
Found Matthew Lentz
Die 100 times
Beat the game on "Hard as Balls" or higher
Beat the game on "Impossible" or higher
Beat the game on "YOLO"