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 4 completed
Level 5 completed
Level 6 completed
Level 7 completed
Sell tower
Level 3 completed
Improve hp
Set fire shells
Set trap
Build magician tower
Level 1 completed
Level 2 completed
Improve damage
Build knights tower
Improve accurancy
Improve speed
Build archers tower
Russian language
English language
Use mini knights help
Exit the main menu
Exit the game
Enable sounds
Disable sounds