1942: Joint Strike

This achievement says "Complete the game with over 200,000 points" and seriously there isn't much more to it than that. Even if you totally bomb the boss times you should still net close to 1,000,000 points by the end of the game. I'm actually surprised they didn't increase this threshold because I'm not even sure its possible to beat the game with less than 200,000. :-/ As far as Single Player or Co-op is concerned for this achievement, it seems as if only the host gets this achievement at the end of the game if you are playing online. So either grab this in Single Player or host your own Xbox Live Co-op match.