Here is the full list of all 21 WazHack achievements.
The base game contains 19 achievements, and there is 1 DLC pack containing 2 achievements.
Make a wish as a male character.
Get to level 10 with 4 characters.
Get to level 10 with all characters.
Win the game.
Sell 200 weapons, except arrows.
Kill 100 mobs with ranged wand attacks.
Kill 1000 mobs with ranged wand attacks.
Make a wish as a female character.
Pick up 1000 pieces of paper.
Have 10 pets alive at once, not undead.
Get any unique item.
Find 10 different unique items.
Win playing the whole game in your underwear.
Win only eating meat and certain goos.
Win eating no meat and only certain goos.
Get every possible item.
Kill every mob type at least once.
Win the game with every character.
Win the game on Nightmare III above level 7.
Kill 4 mobs with a single ranged wand attack.
Kill 10 mobs with a single ranged wand attack.