Here is the full list of all 14 Monsters Den Chronicles achievements.
Play Act IV and pass wave 30 (above Beginner difficulty)
Complete all in-game achievements
Complete a campaign with a party of two
Reach level ten with ten different characters
Complete a campaign on Veteran difficulty
Complete Act V
Complete a campaign with the Hardcore penalty
Pass wave 10 in Act IV
Take all store categories to the maximum level
Complete Act III
Reach level ten with any character
Complete Act II
Complete Act I
Win a battle against 3 or more enemies without taking damage