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