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