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.
100000 KILLS
25000 KILLS
Quit the game
9999 KILLS
Kill 1111 meteors in 1 lvl
Click Backspace
Click Pause
Click End
666 KILLS
Accuracy 100%
Change Music Vol
Click MainMenu
Click Undo
Click Enter
Click Tutorial