Here is the full list of all 14 Doodle Kingdom achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Level up your Hero to level 21
Level up your Hero to level 16
Create all elements in Main Game
Open all elemental elements
Buy 10 belongings for your Hero.
Level up your Hero to level 10
Complete 3 quests
Invent all spells
Create all magical creatures.
Create all 3 towns
Complete 1 quest
Buy some equipment for your Hero
Level up your Hero to level 1
Level up your Hero to level 4