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