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