Far Cry 2

In order to unlock this achievement, you need to become rank 5.

Note: Rank 5 means that you will need over 2,100 experience.

I would recommend you boost this achievement with two other people by having one person shoot at the second person then the third person would revive the second person when they were knocked out, then repeat again and again. Also, make sure you don't pass over the 1,500 XP limit every game. If you are unable to get two other people and you cannot boost then try to earn it, it shouldn't be as hard to earn this amount of XP.