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