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