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