0 day Attack on Earth

For this achievement you have to kill 10 of the enemies that try to grab onto the nose of your ship. They appear as a yellow dot on your radar (along with the other 'special' enemies like the sandwich enemies). They are easy to kill - just back away from them as they approach you. They are only really dangerous when you are already concentrating on bringing down some other enemies. If you are playing in co-op, your buddy can shoot it off your nose but in single player the AI is too dumb and a mosquito can be a death sentence.

The count is cumulative so this does not have to be done in one game.