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