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