Here is the full list of all 22 UROS: A Trip Through Shadows achievements.
Defeat 50 enemies
Unlock the “Ranged Attack” skill
Defeat 25 enemies
Defeat 10 enemies
Unlock the “Healing” skill
Get all achievements
Unlock the “Dash” skill
Unlock the “Wall Jump” skill
Unlock the “Double Jump” skill
Defeat Lisovik, the Torturer
Defeat Strogobor, God of the Nightmares
Free 5 Nocks
Free 10 Nocks
Free 20 Nocks
Defeat 100 enemies
Get an extra life
Reach the maximum healing points
Unlock the whole map
Die 5 times
Collect 500 souls
Buy an item
Buy all items available