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