Here is the full list of all 15 Split achievements.
Press 4 buttons at once.
Complete Welcome to Split and Tutorial Island.
Only split your cube once.
Complete 50% of the game.
Complete 75% of the game.
Complete 100% of the game.
100% all levels.
Lose all your cubes.
Fall into the water.
Restart 100 times.
Play through a second time.
Play the game without restarting once.
Completely split your cubes.
Don't touch dem cactus.
Restart 10 times.