Here is the full list of all 25 Throne of the Dead achievements.
Earn your first star!
Earn 15 stars!
Slay 100 enemies!
Slay 200 enemies!
Slay 1000 enemies!
Acquire the Ray Gun!
Try out some Skins!
Earn 3 stars on Bathroom!
Earn 3 stars on Farm House!
Earn 3 stars on Construction!
Earn 3 stars on Ol' West!
Earn 3 stars on Polar Poop!
Unlock All Original Skins!
Earn 500,000 Points!
Earn 1,000,000 Points!
Use 10 Powerups!
Use 100 Powerups!
Ignore 30 Powerups!
Use a Double Points Powerup!
Die 50 Times!
Start the Music!
Gotta Love Explosive Barrels!
Survive 50 Waves!
Survive 150 Waves!
Acquire the Freeze Gun!