If you're like me and needed this quickly, for a contest or event, and don't have much of the campaign done, load up Cold War (mission 2). After the tank gets blown up and you kill two guys on a Quad Bike, you can jump on the Quad Bike and loop back through the previously cleared area and keep driving back and forth until the achievement pops. It takes several minutes. But it's better than going through the campaign just for this. I went from where I jumped on the Quad Bike all the way back close to the bus, turned left and back around the cement barriers and back up the road I just came from.
I'll figure out where my video went and add it again.
Sorry, this Game Clip has been removed
I mostly played BFBC2 on PC back when it came out. When I finally got the 360 version, I didn't really get into it again due to other games to play.