Here is the full list of all 18 Tiny Witch achievements.
Complete the forest store
Serve 25 impatient customers!
Complete the village store
Buy all the cauldrons
Burn items 15 times
Complete the cave store
Complete the desert store
Complete the challenge mode
Discover all the recipes!
Serve a clown minion
Buy each pet at least once
Buy each decoration once
Play only using PETS!
Only play with decoration!
Play store without using a broom!
Play a store without taking any damage!
Get 15 golden runes!
Serve 20 rich customers!