The matchmaking will pair you up with people that are a similar rank as you. You' re going to have to tank a few matches in the effort of getting your rank as low as possible. This doesn't mean you have to lose on purpose neccesarily; try playing as a character you are unfamiliar with for some practice. You'll likely lose but you will get a little experience for when you have to go back to that character in the future.
I won 3 in a row on literally 5 seperate occasions before getting this. It seems like the game knows your hot so they almost always pair you up with someone ranked a little higher on that fourth match. Coincidentally, I also ranked up myself around that fourth match, further making the matchmaking unfavorable for this achievement.
Get your rank low then go for this, and be prepared mentally for that fourth match against what is likely a tough opponent.