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