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