Here is the full list of all 28 Vampire's Fall: Origins achievements.
Refuse to bite Sava Savanovic
Find the world cornerstones
Complete the brutal mazes
Complete the expansion "The Hunt for Sava"
Defeat Arvid Varanger
Defeat Shadow from The Abyss
Defeat God of Brutals
Defeat God Brutal of The Wild
Defeat Xaphxan The Invisble
Defeat Enigma
Defeat The Rat King
Defeat The Tusk Trio
Defeat God Brutal of Guard
Defeat Fulacks the Ugly
Defeat Styx's Servant
Defeat Lernaean
Defeat the Hunter Killer
Defeat the being in the Rat Tree
Find and defeat the three spirit brothers
Defeat the Mother of Wolves
Defeat the Koccuburry Cave Dweller
Defeat Death's Advocate
Defeat Aendisea's Bane
Open the seals of Gont
Defeat the Beast of the Valley
Defeat Vaso
Bite Sava Savanovic
Survive the attack on Vamp'Ire