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
Defeat Morgaine
Open all treasure chests
Complete the Ancient Path
Get the first ending
Win the second Tournament
Defeat at least 4 enemies with a single hit
Complete the Obelisk riddle
Craft a final-tier weapon
Visit the fifth Relic
Master all 19 base Monster Classes
Master all 6 special badge Classes
Visit the fourth Relic
Master all 20 base Human Classes
Master all Human story character Classes
Cleanse the Cursed Shield
Recruit Kairu
Unlock the Spymaster Class
View all optional dialogue events
Defeat Lady Anquine
Obtain all gadgets
Unlock all 20 base Human Classes
Complete the Halloween encounter
Defeat an enemy with a Berserk, Charmed, or Mind-Controlled enemy
Open 50% of treasure chests
Save Somier a second time
Win the first Tournament
Defeat an enemy with falling damage
Recruit Katja
Visit the third Relic
Use your first Class badge
Recruit Bzaro
Visit the second Relic
Unlock the Demon Knight Class
Recruit Yates
Defeat an enemy by using a Counter Ability or Thorns
Master any Class
Visit the first Relic
Drown an enemy
Unlock the Marked Class
Craft your first item
Defeat a unit with its Elemental weakness
Change Class at least once
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.