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