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