Band of Bugs

This walkthrough helped me obtain both of the gold medal related achievements: http://www.gamefaqs.com/xbox360/938058-band-of-bugs/faqs/505... It was also an excellent guide for completing every mission for all three campaigns. As far as advice goes, all I can really offer is to save often. A critical hit from an enemy can easily take out one of your weaker characters, subtracting points from the score.

I take no credit for the guide, all credit goes to the guide's creator; ThermalStone. If you find it helpful for yourself as well then I encourage you to leave positive feedback for the walkthrough itself on GameFaqs' site.