Stormrise

Easiest way since there is little to no online play without a friend is to simply have your boosting buddy not build any units. Max your starting resources and then build either 2 Rift Worms or 3 Hunter aircraft (each side has their own air units... both are equally as destructive) depending on which faction you are and go to the other base to kill their commander. This will probably pop after your first ranked match (assuming you are the victor)

The Fastest way to get this is by starting a Ranked Online match. It is dead so you will need a boosting partner to get this done!!!

The person going for the achievement (As well as the 6 wins in a row) MUST be the host of the match. Have your partner join after the session is set up.

Once the match begin, simply have your partner (the loser) quit out. You will win instantly and the achievement will unlock

This achievement is very easy if you work fast. If you read my guide about the "Winning Streak" achievement, this follows the same procedure.

Pick the smallest map that you would like to play on and start as the Echelon. As soon as you start, build 3 pairs of Hunter aircraft and send them over the your boosting partner's leader.

Make sure that your partner doesn't move from the starting position and just gun him down when you arrive. If there were no hold ups, this should be done in under 5 minutes. I hope this helps some people and good luck.