No missable achievements (plus 19 unknown)
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Die 100 times
Ride the Fire shark
Kill Santa
Drink 100 beers
Kill Naggi
Find all playable characters
Found Matthew Lentz
Enter a cheat code
Find Craig
Beat the game on "Normal" or higher
Die 1000 times
Find all the cameos
Find all S*** Pickles
Collect 200 1ups
Beat the game on "Old School" or higher
Beat the game over Halloween weekend on Normal or Higher difficulty
Beat the game on "Hard as Balls" or higher
Beat the game on "Impossible" or higher
Beat the game on "YOLO"