Here is the full list of all 10 Isotiles achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Completed 5 levels
Completed 10 levels
Completed 15 levels
Completed 20 levels
Completed 25 levels
Completed 30 levels
Completed 35 levels
Completed 40 levels
Completed 45 levels
Completed 50 levels