You will get this trying to unlock 50 awards and there are way more than 50 awards online so this will be pretty easy. Here are a few tips:
-During matches stick to one class to get awards for that class then change to another class and get awards for it too.
-Join a squad a work together as a team! There are several awards for teamwork and teamwork will make your Battlefield experience more enjoyable as well!
-Kill streaks in vehicles will unlock awards too, if you are not good at driving/flying in Bad Company 2, find a friend to drive for you and get in a gunner seat.
You should have no problems earning awards on your path to ranking up online, but if you do, here is a list of the awards:
http://www.xbox360achievements.org/forum/showthread.php?t=21...Stars earned for weapons and vehicles count towards this as well.