You need to get 10 consecutive kills in a quick match WITHOUT DYING.
** Kills carry over between rounds in a match **
I got 7 kills in a decoy room during the first round, then got 3 kills to start off the second round, and the achievement popped.
I wish I could say there is some magic, easy way to get this, but there isn't. Just try not to "run and gun" and hang back. I got my first 7 kills defending on decoy, as I was defending the objective, then managed to get 3 more while attacking next round. Playing as recon probably isn't a terrible idea as you can be a little more hidden with the active camo. I hate to encourage this on a Ghost Recon game, but you may need to CAMP :-(