The Outfit

This is one of the achievements that won't pop until you have played 20 games AND meet the criteria. This does not have to be done in Ranked Quick Match. I set up Custom Matches with 1000 starting resources, no respawn delay, and FU crates every 200 sec. (Use D-pad to change settings.) The best map is Estate Assault.

Mr Tavaghoee and I boosted this by alternating wins and it didn't take too long after we figured it out.

Working together, the winner can average about 100 points per minute, which makes up for any matches you may have goofed on already. (I had one 22 minute match where I scored only 10 pts!)
The loser doesn't score at all, but if you alternate, that still comes out to 50 pts/min.

Player A, who's doing the scoring, starts the match by grabbing whatever free vehicle is lying around and going and claiming the Motor Pool. Then buy the best tank you can (Calliope for USA).

Player B stays in their base and spends all their FU on the cheapest jeep you can build. Just keep spawning them.

Player A then goes to Player B's base and sits far enough from the flag so as to not take it over.

Player B repeatedly gets into vehicles with his AI teammates and Player A blasts them.

Player A then spends their money in between kills by spawning more cheap jeeps for Player B to hop into.

Rinse and repeat.

Remember: timing is key, so look for ways to speed up the process, like parking on the side of the base where Player B is more likely to spawn.

The best way to score points is with PLAYER KILLS.
Make sure YOU are in the gunner seat of the tank.
Choose the character with the best buying power for cheaper vehicles.