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
Get the second ending
Complete the Ancient Path
Open all treasure chests
Defeat Morgaine
Defeat an enemy with falling damage
Win the second Tournament
Get the first ending
Craft a final-tier weapon
Complete the Obelisk riddle
Master all 6 special badge Classes
Visit the fifth Relic
Master all 20 base Human Classes
Master all Human story character Classes
Cleanse the Cursed Shield
Open 50% of treasure chests
Complete the Halloween encounter
Defeat at least 4 enemies with a single hit
Obtain all gadgets
Visit the fourth Relic
Recruit Kairu
Defeat an enemy with a Berserk, Charmed, or Mind-Controlled enemy
Unlock the Spymaster Class
View all optional dialogue events
Defeat Lady Anquine
Recruit Katja
Save Somier a second time
Use your first Class badge
Visit the third Relic
Win the first Tournament
Master any Class
Recruit Bzaro
Unlock all 20 base Human Classes
Visit the second Relic
Unlock the Demon Knight Class
Recruit Yates
Visit the first Relic
Drown an enemy
Unlock the Marked Class
Craft your first item
Change Class at least once
Defeat an enemy by using a Counter Ability or Thorns
Defeat a unit with its Elemental weakness
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.