Unfortunately, there don't seem to be any settings to make matches this go faster. At least you don't have to win to progress this one.
Start with getting
done as they may take 200 or more matches anyway. Once you have them unlocked, you can work on your remaining matches using one of these methods:
Quickest: Private match with a friend that's willing to beat you up fast to level his characters, so that new matches happen quickly.
Easiest: Private match with a friend, idle, and let the timer run out.
Either way, you'll still have to click
at the end of every match, so you can't walk away completely.NOTE:
If you notice that the achievement has stopped progressing, use this workaround from The SCHWARTZ 00
What I had to do was:
1. Quit the game from the dashboard
2. Go offline in settings
3. Restart the game
4. Connect back to XBL while at the main menu
I then played a match after it reconnected and it counted.