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