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 all levels
Complete Sci-Fi
Get killed by lazer
Complete Winter
Comlete level less than 10 seconds
Fall down after wind blow
Complete Western
Complete Fling Islands
Fall more than 15 times on one level
Fall more than 10 times on one level
Collect all umbrella at one level
Don't fall after mine explosion
Complete Tutorial