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