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