Here is the full list of all 37 Stonerid achievements.
Die 200 times
Collect 5,000 toxic substances
Complete the Winterland
Die 100 times
Kill 100 monsters
Collect 500 gemstones
Complete the Endless Autumn
Get one crown on normal or hard mode
Complete one level on hard mode
Complete one level without dying on normal or hard mode
Kill 50 monsters
Complete one level on easy mode
Complete the Dark Forest
Complete one bonus level
Die 10 times
Collect all gemstones in one level on normal or hard mode
Clear one level from toxic substances on normal or hard mode
Complete one level on normal mode
Find all secrets in one level
Complete a tutorial
Complete the Caverns
Complete the Cemetery
Complete the Swamps
Complete the game
Complete 10 bonus levels
Complete all bonus levels
Get 50,000 points in one level
Clear 10 levels from toxic substances on normal or hard mode
Clear 20 levels from toxic substances on normal or hard mode
Clear all levels from toxic substances on normal or hard mode
Get 10 crowns on normal or hard mode
Get all crowns on normal or hard mode
Collect 1,000 gemstones
Collect 2,000 gemstones
Collect 10,000 toxic substances
Collect 15,000 toxic substances
Kill 200 monsters