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