Here is the full list of all 17 Magic Thief achievements.
Complete all levels perfectly
Complete the void
Complete all the classic levels
Talk to a hermit magician
Complete the kings crypts
Give money to the peasants
Complete the goblin caves
Give the eggs to the dragon
Help the villagers
Complete the dungeons
Return things to relatives
Steal a teleporter
Open the cell in which the crystal lay after the rings of time
Use a sensitive powder to scout 20 cells within one level
Complete the taverns
Solve the merchants' issue
Activate the mimic with the transfer sphere