All of the online achievements can be quickly boosted if you know what to do. Ranked matches give you a random opponent, so you can have trouble finding your boosting partner, especially if you live in the US. A way around this is to simply tell your Xbox that you live somewhere exotic. From your Xbox 360 dashboard, go to System Settings>Console Settings>Date & Time>Timezone and select the same timezone as your boosting partner. Choose somewhere random that would be asleep when you want to boost.
All these achievements can only be unlocked in the Ranked mode. Team Up, Crew and Pick Up games do not count. To make this super super easy, just find each other and start the game. Once the game has started and a player has the ball, they have the option to quit the game. Player A has the option to let the match not count, but if they say no, Player A gets a win and Player B gets a loss next to their name. Repeat the process another 18 times until Player A has 19 wins. Now on the 20th match, actually play through the game and make sure Player A wins. At the end of the game, all 6 achievements should unlock at once. Of course these can be done normally also if you can be bothered.
Check the Achievement Trading Thread for others looking to boost this achievement.