More a tip than a solution: I get this achievement playing Capture the Flag, against other guy, in a brazilian server (almost nobody play in some modes). You can try in Japan or Asian Southwest Server, or always can boost this.
I win the round and end up with 4 stars, earning this achievement at the end of round.
This mode isn't the quickiest to win this achievement but 1x1 is easy, if you know that you can win the game.
If you unlock in other easy way/mode or find that my solution can be improved, please send me a PM or comment below, that I'm glad to change, thanks.