Here is the full list of all 21 Celestian Tales: Realms Beyond achievements.
Defeated the Emerald King.
Solved all personal stories.
Sailed north to Kiahonoa.
Sailed south to Ertheros.
The Emerald King awakened.
Rebuilt the fallen House Aramis.
Lost the noble Companionship status.
Defeated Abel in combat.
Gave the soldier a divine healing.
Convinced Orseans to accept the bandit.
Helped the Fiellite.
Played Aria's story in Old North.
Played Cammile's story in Old North.
Played Isaac's story in Old North.
Played Lucienne's story in Old North.
Played Reynard's story in Old North.
Played Ylianne's story in Old North.
Cleaned the ship.
Stopped the thief.
Didn't give the soldier a divine healing.
Told Orseans the truth.