I've tried over and over and over again to get all the stars on campaign. I've tracked the last campaign mission and STILL can't get 3 stars on normal mode. Wth am I doing wrong. There's no list of requirements letting me know what I need to finish. This is getting frustrating. It starts at the first campaign, level 5.... from there the game REFUSES to give me all 3 stars. No matter what character I use.