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