Completion Strategy:

Err, I don't think I need to put anything here.
Shoot the bad guys (the ones with guns :p), and don't shoot the good guys (The ones without guns..obviously)
You don't have to shoot many to get Bronze, so you should get this first try.

- Neo

Platinum/Fast Time Strategy:

The Platinum Requirement happens to be the best score you can possibly get.
So if you have platinum, you have a WR!
Anyway, this platinum is really easy, the problem most people have is finding 1 or 2 guys that don't always pop up.

- Neo