Here is the full list of all 23 The Heroines' Last Anthem achievements.
Completed the tutorial
Destroyed the ancient evil orb
Maxed-out Rela's skill levels
Maxed-out Ialantha's skill levels
Maxed-out Ewella's skill levels
Upgraded a skill level
Performed 10 Glory Charges
Fired 100 arrows
Fired 100 throwing knives
Collected 3000 gold
Colleged 300 Gold
Defeated all bosses in Hard Mode
Defeated 50 orcs
Found a heroic spirit in a hidden area
Collected all heroic spirits
Jumped 10 times on a mushroom
Defeated Dhiwoubos
Defeated Chuq
Defeated the Azure Demon Lord
Unlocked a hidden story
Opened a door with a key
Opened 10 treasure chests
Defeated an orc heavy-armored warrior