Full list of all 53 Fell Seal: Arbiter's Mark achievements.
The base game contains 43 achievements, and there is 1 DLC pack containing 10 achievements.
Defeat Morgaine
Master all 19 base Monster Classes
Master all 6 special badge Classes
Get the first ending
Get the second ending
Complete the Ancient Path
Open all treasure chests
Win the second Tournament
Master all 20 base Human Classes
Complete the Obelisk riddle
Recruit Kairu
Defeat an enemy with a Berserk, Charmed, or Mind-Controlled enemy
Craft a final-tier weapon
Obtain all gadgets
Use your first Class badge
Visit the fifth Relic
Master all Human story character Classes
Visit the fourth Relic
Cleanse the Cursed Shield
Complete the Halloween encounter
Unlock all 20 base Human Classes
Defeat at least 4 enemies with a single hit
Open 50% of treasure chests
Unlock the Spymaster Class
View all optional dialogue events
Defeat Lady Anquine
Save Somier a second time
Recruit Katja
Visit the third Relic
Recruit Bzaro
Win the first Tournament
Visit the second Relic
Unlock the Demon Knight Class
Recruit Yates
Defeat an enemy with falling damage
Visit the first Relic
Drown an enemy
Craft your first item
Unlock the Marked Class
Master any Class
Defeat an enemy by using a Counter Ability or Thorns
Change Class at least once
Defeat a unit with its Elemental weakness
Master all 22 Monster Variants.
Enlist each of the base 18 recruitable Monster types.
Master the 3 new Human Classes.
Complete all unique Hunts and large-scale battles.
Complete all Missions.
Complete an encounter deploying only Monsters.
Defeat an enemy with a Pet Effect.
Fully upgrade all 5 regions.
Complete 100% of Missions in one region.
Build a Guild Upgrade.