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