Here is the full list of all 29 Kingdom Defense achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Level 12 completed
Level 11 completed
Level 10 completed
Level 9 completed
Level 8 completed
Level 7 completed
Level 6 completed
Level 4 completed
Level 5 completed
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English language
Sell tower
Improve speed
Set trap
Build magician tower
Level 1 completed
Level 2 completed
Level 3 completed
Improve damage
Improve hp
Build knights tower
Use mini knights help
Improve accurancy
Set fire shells
Build archers tower
Exit the main menu
Exit the game
Enable sounds
Disable sounds