Here is the full list of all 29 Casual Pixel Warrior achievements.
Start a first game
You have bought a lasergun
Finish all waves in level Greenland
You have bought a shotgun
Finish all waves in level Snowland
You have bought a flamethrower
Finish all waves in level Wasteland
You have purchased a plasmagun
Defeat the boss and win the game
You have purchased access to snowland
You have purchased access to wasteland
You have purchased access to lavaland
You have survived 15 minutes
You have survived 30 minutes
You have survived 60 minutes
You have bought a rocket launcher
Who is a good boi?
Purrr Purrr
Baaa, gimme food
Kitsune wants cuddles