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