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