Here is the full list of all 16 The Wizards Who Fell In A Hole achievements.
Collect 100 special items
Collect each type of special item
Kill 1000 monsters
Eat 1000 pieces of food
Collect 50 special items
Eat 500 pieces of food
Kill 500 monsters
Get half way through the game
Eat 250 pieces of food
Defeat your first boss
Complete your first level
Complete the game
Find the elusive Battenberg
Eat 2500 pieces of food
Score a million points
Kill 2500 monsters