Here is the full list of all 17 Dungeon Hearts achievements.
Unlock 40 Enemies in the Bestiary.
Finish the game in 40 minutes or less.
Finish the game without using any Skills.
Finish the game with at least one Level 1 Hero.
Defeat The Dark One on Hard difficulty.
Finish the game without any Hero getting knocked out.
Defeat The Dark One.
Unlock 20 Enemies in the Bestiary.
Use all four Hero's final Skill in the same battle.
Reach Level 60 with any Hero.
Reach battle 7.
Unlock 10 Enemies in the Bestiary.
Reach battle 15.
Achieve an attack multiplier of x7 or more in a single attack.
Reach Level 20 with any Hero.
Use all four Heroes in a single attack.
Complete the tutorial.