Here is the full list of all 25 Morbid: The Seven Acolytes achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Unlock all Blessings
Fall 100 times
Defeat King Cornelius, the Heir of Regret
Defeat Vulgus Calia, the Mass of Terror
Kill 50 Elite enemies
Defeat the Acolytes and Liberate Mornia
Slay an Acolyte, without taking any damage
Discover Gardens of Mornia
Discover Tomb of the King
Discover City of Yortael
Discover Concert Hall
Discover Felfields
Discover Necropolis
Discover Cathedral of Wrath
Defeat Lady Tristana, Mother Grief
Defeat Maestro Bibé, the Anxious Prodigy
Defeat Bile Toad Putrus, the Spawn of Disgust
Defeat Inquisitor Odius, the Scholar of Hate
Upgrade a Blessing to the maximum level
Find the Broccoliath body and the Blader from Grimwald’s Grove.
Discover Grimwald's Grove
Discover Village of Aer'Abuh
Defeat Lorn the Blind, the Lord of Loneliness
Discover Caverns of Solitude
Discover The Cursed Hamlet