Having problems shooting asteroids in level 4. Previous answer was no help?

Set the brightnes to high. That will able you to see the asteroids and shoot them before they get close. For the small asteroids use single rabid fire to destroy them. For the large ones use the double fire, you'll have to shoot them a couple of times to destroy them.

There are no cheats but having good aim and using only the one-shot can help a lot not only with passing that part, but with getting that achievement.

I know this may not help you. But I was having the worst time at this. I was convinced I couldn't do it. By the time that jackass says the third time. "Just a little longer" I usually have about 10% left and there is a field of asteroids still hitting me. So I tried to turn the brightness up. And I noticed that gave me a little more time. But I was getting to on edge from the music and the guy and the computer talking. What I did was turn off the volume. First time I did that I finished with 16% left. It may not help you but it sure did keep me more calm and I was able to finish it the first try with no sound. Give it a go, it can't hurt...