Start a skirmish match on Memorial basin
-2v2 with AI on easy
-Play as the guy who gets heavy supply pads immediately.
-Don't bother adding anything to your base aside from supply pads, your AI will defend you both
Once you have all the heavy supply pads built just wait until you hit 7,500 (Costs 300 to send which gives them 200) and then go to a supply pad and send all of your supply points to your singular ally. Once done with that press
and then click on resign which will end the match and pop your achievement.