Here is the full list of all 13 HardCube achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Complete Fling Islands
Collect all umbrella at one level
Fall more than 15 times on one level
Fall more than 10 times on one level
Don't fall after mine explosion
Complete Tutorial
Complete Western
Complete Winter
Complete Sci-Fi
Complete all levels
Comlete level less than 10 seconds
Get killed by lazer
Fall down after wind blow