Supreme Commander 2

To easily boost 25 wins setup a skirmish assassination versus an easy computer on open palms map. Build 3 land factories and make 10-15 tanks. Send them to the enemy base and target the ACU. Rinse and Repeat.

More productive if you do the "Sightseer" achievement together which consists of winning all the maps in the game, there are a total of 20-24 maps, requiring you to play one more game to unlock the achievement. To do this quickly you can place the AI in Easy and build Cybran Gemini with the Cybran faction that serves both to attack airships and to destroy ground enemies, that is, the enemy ACU.

Or you can do the "Supreme Online Commander" achievement that you need to win 25 ranked matches, the easiest way to do this is to find another player who wants this achievement and when you start the ranked match one of you leaves the game thus giving the win instantly for the other.

FOLLOW THIS GUIDE AND YOU CAN GET THE "SUPREME ONLINE COMMANDER" & "TO THE VICTOR..." ACHIEVEMENTS AS WELL.

JUST MAKE SURE YOU KEEP PICKING THE SAME FACTION!

I'm guessing since this title is now GwG (March 2016) - There is lot more people playing.
When following his solution (z RagnaroK z's Supreme Online Commander), we teamed up about 50% of the time.
We came up with a solution to change our Location via Xbox Settings.

The same game plan applies - Find a boosting partner, go to Ranked under Xbox Live.
We noticed that (even changing location settings) if we didn't pick a certain game type, we were less likely to match up. So make sure you both pick the same game type.
When the game starts, the person giving wins simply quits the game.

FOR 360: Head to the "Settings" tab - Go under "Family" & make sure that setting is turned off. Next head under "System" - select "Console Settings" - select "Language and Location" & finally "Location" - This is where you pick the region you want to be in when matchmaking.
Now restart the 360 just to make sure the changes take effect.

For Xbox-One: Go to "Settings", Select "System", Select "Language & location."
Now select your new location from the list, and then select "Restart now!"
You must RESTART the Xbox-One.

The locations that worked best for us was: Singapore & South Africa (South Africa being a bit better). Although your free to chose which ever you feel might be less populated.

After changing these settings and attempting to match up again - We went from 50% match ups to about 85-90%!