Since only a few very good people is paying this online, the best way to win this is by boosting.
Find a buddy and do quick matches. As soon as the match starts (or at least make 15-0) the boosting partner can forfeit and it will count as a win for the other.
Beware, that this only works for the 5 and 10 win streaks. For the other online achievements, you have to complete the match.
Contribution from Ginn0rz: If there is a large difference between each of your player ratings you may not be matched through the Quick Match system. If this happens, the both of you should create a new character, choose this character in World Tour mode, choose Quick Match and you should be linked to each other straight away because both of your starting skills will be 30.