Stormrise

Nobody plays this game online, so you'll probably have to boost to get this achievement. One easy way to do this is to choose the Sai, while your boosting partner picks Echelon, on the Sink Hole Map, High starting resources (RANKED!).

Simply build 3 flying Worms (1200$), group them (LB+ A) and fly near the Echelon's base. Your partner needs to build 11 soldier troops. Make sure he builds only 1 or 2 troops at a time, and that he brings them near your worms (the area next to the first power node near the Echelon's spawn is a great place to do this). Once the 11 troops are dead, you'll get the achievement in-game. Kill the commander to finish the game, and do it again to help your friend.

With resources set to high, you don't even need to capture a power node. You'll get it done in <5 minutes easily. Good luck!

To unlock this achievement you must destroy 11 enemy units within 5 minutes, the easiest way to do this is to build a decent sized army and stand near a node where units are being made on the opposite team or you could obviously boost this with a friend.