Here is the full list of all 26 BoxCat achievements.
You've actually run the game!
Jump 100 times
Do a powerbomb 100 times
DIE from scratch
Die 100 times
Die 100 times by fire
You should call 911
Die 100 times by fall
Die 100 times by spikes
Die 100 times by projectile
Die 100 times by monster
Clear chapter 1
Clear chapter 2
Clear chapter 3
Clear chapter 4
Clear chapter 5
Clear all the levels
Collect 100 coins
Collect 200 coins
Collect 300 coins
Collect all the coins
Die 99 times in A level
Use a TNT box
Kill monsters 100 times
Ride a motorcycle