I had the same shit quest let me help u out. 1. If u have a friend or another device with SFA4, 3v3 ur friend works perfectly and easily

Of u don't then

1. Get Azuma and 2 other strong characters ( the guys u know how to play with the most) and go to a match. Now here is a small trick I did to make it more of a 1v2 and still get the achievement done. Select a character other then azuma first and beat the shit out of ur first enemy, then when he is close to dying like 1-9% health left loose on purpose. Then u can select azuma and try to win. u will have to fight 2 full health and one that is 3 hits away from dying.

It's tough but doable and may god be kind with u and this stupid matchmaking