Here is the full list of all 10 Totally Unbalanced achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Fall 8 Times in the water
Fall 3 times in the water
Fall for the first time
Customize your Singleplayer Ball for the first time
Fall 10 times
Fall 15 times
Fall 25 times
Fall 35 times
Fall 50 times
Customize your Multiplayer Ball for the first time