You will get this achievement in a matter of time if your going for the weapon achievements, played games or ones like "Hat Trick" or any others. Just keep changing maps and gamemodes and setting the modes to achievement requirements like 3 flags and 20 points ect. Choose novice bots to play against for this.
If you want this fast just play novice bots to the lowest requirement for the game (such a 5 kills or 1 capture).
This is not recommended though if you have not unlocked the weapon kill achievements or the 100 games played ones.