Quickest way to obtaining this achievement.
Find a friend who wants to boost.
Join a server that is very quiet on network, i used the second english one and then #17. We were the only 2 in there!
Either your friend or yourself create a ranked match room and then join. pick what ever teams you want.
Choose who is going to gain the achievement 1st as they will have to win 15 out of 20 games.
Whoever you have decided, play the whole game through on a 5 minute game and make sure they win. (own goals, whatever it takes)
After the game has ended, create another room, again choose whoever you want but as the match starts the player who is choosen to lose quits the match straight away.
You should get a 3-0 default win. Repeat this until you get to the 15th game. The 15th game you play through again to the end and win. Now you change who wins to the other player. Play the whole of their 1st game, losing it then quit the other 13 games. On the 4th game you quit the first winning player of 15 should recieve the achievement. After quitting 13 times and rejoining the rank matches play the last match in full, lose this 1 aswell and your friend should also have the achievement. This took us about 2 hours to do in total. But alot quicker than playing every game!
Any questions please ask before voting, i don't always explain things well!