Co-op Brilliance (20)
Obtain a score of 30,000 or more while playing an Xbox Live co-op game.

1. The 1st level is really easy to get lots of points in without dying so you could fly your plane into the rocks before reaching the 2nd level checkpoint so that you start the 1st level again to make some extra points.
2. Remembering levels because I'm pretty sure it never changes. Enemies always come from the same places so memorise them to know what's coming.
3. Even if you are concentrating on shooting the spaceships which fly up using your machine gun, it's still a good idea to keep tapping X to drop bombs which could potentially hit something for effortless points.