Too many glitches in this game, like freezing, not loading after finishing a level, staying dead (lying down) when you retry for the next day, infinite ammunition, weapon not switching, etc. And the hard badge is too easy, for a really easy way, do as many headshots as you can in a level, then let yourself die, and repeat. 30 points easily.
@CrackerBob100 "Oh, a rusty old and heavy diesel truck. Better replace it for my fortified, armored, gun-mounted firetruck of destruction."
That and "I have a lot of fuel, let's leave it there and take the truck with not much in it."