Here is the full list of all 18 Morbid: The Lords of Ire achievements.
Reach The Sanctuary
Discover the Cursed Mountains
Discover the Rotten City
Discover the Ancient Crater
Discover the Fallen Capital
Discover the Horrid Hive
Complete a cycle in the Cycle Unending
Fill out Morbid Menagerie
Return all Tomes of Insight to Yan
Return all Molders Toolkits to Atoz
Return all Cosm Stones to Bol
Max out a weapon
Max out a Blessing slot
Slay an Acolyte without taking damage
All achievements unlocked
Offer all Relics to the Hag of the Hall
Banish 13 Spectres
Complete all quests