Here is the full list of all 30 Curse of the Dead Gods achievements.
Write all Bestiary entries with their complete sketches
Become the new Champion of Death
Complete 10 different "Special Events"
Complete any exploration with 50 or more Constitution
Equip the three weapons slots with Cursed weapons
Complete any exploration with 50 or more Perception
Unlock all Weapon Altars upgrades
Defeat Clovis Pardieux, Champion of Death
Make 10 Blood Offerings during a single exploration
Defeat the Dark Avatar of the Serpent
Complete any exploration with 50 or more Dexterity
Defeat the Dark Avatar of the Eagle
Lift the Final Curse
Defeat the Dark Avatar of the Jaguar
Get 3 successful Parries in less than 2 seconds
Unlock 20 Blessings of the Dead Gods
Equip a hidden Champion weapon
Defeat Ratyapu, the Abomination
Unlock 20 Forsaken Weapons
Defeat Malok paal, the Flesh Monstrosity
Start a "Special Event"
Defeat Litz & Nepac, the Cursed Twins
Write 5 Bestiary entries
Unlock 5 Forsaken Weapons
Defeat Xucat', the Witch
Achieve a x10 "Greed Kill" series
Defeat K'ax taca, High Lord of the Storm
Defeat Xak'olchir, the Blood Hunter
Unlock a Blessing of the Dead Gods
Complete the room of Trials