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