Here is the full list of all 20 Dungeon & Derision achievements.
Kill 50 chickens
Wear Jo's head on the beggar
Loot the strange grave without getting the curse and without the help from the priest
Kill the king in less than 30 minutes
Kill the king with the priest, the ranger and the barbarian
Kill the King 10 times
Kill the Leprechaun, but your heroes must be level 3 or less
Never recruit new heroes and kill the king
Whip the sadist
Carry the magical girl staff on the wizard
Kill the beggar on the first fight, then finish the game in hard mode
Wear the full gingy equipment on two heroes
Wear the full skeleton equipment on every heroes
Kill 5 chickens with the beggar
Let a chicken kill the beggar
Collect 999 or more gems
Unlock all heroes and all upgrades for your heroes
Kill the king under 10 turns
Finish the event in the village
Resurrect a hero