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