Here is the full list of all 44 8Doors: Arum's Afterlife Adventure achievements.
Clear the game without dying.
Clear the game without learning any other Perk except Duoxini
Complete Normal Mode in 3 hours
Land of Abundance 100% complete
All regions 100% complete.
Interacted with all Dawn Tombstones
Guided all Fugitive Souls
Misty Forest 100% complete
Obtain all Messenger Perks
Obtain all Perks
Obtain all Flowers of Life
Crimson Mines 100% complete
Barren Grounds 100% complete
Obtain all Pathfinder Perks
Frozen Plateau 100% complete
Underground Waterway 100% complete
Kingdom of Yama 100% complete
Stone Mountain 100% complete
Obtain all Reaper Perks