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