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