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