Here is the full list of all 31 EvilQuest achievements.
Eat 10 Hams and 10 Steaks
Eat 75 Pieces of Food
Reach a Toughness level of 35
Reach a Vitality level of 35
Reach a Strength level of 35
Reach an Intelligence level of 35
Beat the game on Normal
Beat the game on Difficult
Kill 1500 enemies
Kill 100 Dragons
Equip all Chaos Gear
Equip The Invisibility Cloak
Equip The Amulet of Magic
Kill 8 enemies at one time with Shadow2
Kill 5 enemies at one time with Lit2
Open The Lightning Seal
Equip all Dragon Gear
Give 1000 GP to a dancer
Obtain a portrait of Galvis
Murder 5 deserving NPCs
Kill King Jerric
Kill 50 enemies with Fire2
Open The Fire Seal
Eat 3 Whole Chickens
Freeze 30 enemies with Ice
Kill 750 enemies
Open The Ice Seal
Kill 4 enemies at one time with Earth2
Open The Earth Seal
Kill King Jerric's top general
Learn Ice1 and kill your teacher