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