Here is the full list of all 15 Keyboard Killers achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Click End
Kill 1111 meteors in 1 lvl
666 KILLS
Quit the game
Accuracy 100%
Click MainMenu
Click Backspace
Click Pause
Click Undo
Click Enter
Click Tutorial
Change Music Vol
9999 KILLS
25000 KILLS
100000 KILLS