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