A very simple way of getting this would be boosting with a friend, but beware of the hidden minimum timer requirement for a match to count--I've had it many times when the other team quits/resigns under 2 minutes into a game, I get no credit for winning!
The preferred solo method:(credit to The GTA Guy 69 I think for discovering this?)
Load up a skirmish deathmatch against the AI with these settings:
Fog of War: Off
Resources: 9999
Skulls: AFTER PARTY(required!), gives you a tank and infantry everytime you lose a base(including recycling a base lol)
AI: easy, any leader
Your Leader: Kinsano
As soon as the match starts, build on every build point so the AI can't, then just keep recycling and rebuilding the closest mini-base to the AI's homebase to get the bonus tanks. If necessary, you can recycle multiple minibases to speed the tank spawning up!
Once you hit your population cap, send all the tanks at the AI, and micro-manage them a little to destroy things nicely.
The AI will probably try to build on any mini-bases that aren't yours, so make sure to keep them all built! Destroying an AI minibase simply gives the AI a tank, so avoid that.