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 35 times
Fall 50 times
Fall 10 times
Fall 15 times
Fall 25 times
Fall 8 Times in the water
Fall 3 times in the water
Customize your Multiplayer Ball for the first time
Customize your Singleplayer Ball for the first time
Fall for the first time