The way I got this achievement, and personally one of the easiest ways in my opinion is Tier 1 battles. If you get 3+ kills, you're almost guaranteed to get this achievement. I was using the US T1, my personal favorite Tier 1. I don't remember the map, but I got 4 kills and got this achievement.
I think this is a great method because you only have to beat 6 other players instead of 14 other players!
So that's one way you could go at it, but there's another possibly easier method!
Gamers have been reporting that if you complete an XP bonus operation in the match, that these also count for your XP for the achievement. Some have said they got the achievement when they were definitely not even in first place! There is almost always a bonus XP operation ready to select under the Ops tab, so select one or more that looks good and work on it!
Either way, these are a couple good ways you can try. If you do it differently, have a good story to tell, or anything... please comment!