Here is the full list of all 15 Heroic Dungeon achievements.
Kill 10 enemies
Kill 100 enemies
Kill 1000 enemies
Destroy 500 monster heads
Destroy 5000 monster heads
Destroy 50000 monster heads
Complete 1 dungeon
Complete 10 dungeons
Complete 100 dungeons
Complete 5 bonus levels
Complete 25 bonus levels
Upgarde 3 items
Find 25 hearts
Find 25 swords
Find 25 chests