|Kill 60 Freaks in 60 seconds using the blades on the helicopter.|
Start up a singleplayer game and hop into a helicopter. Fly to the quarry (top island of Hope Springs) and wait for the Freaks to come and spread out. Fly to the topmost path and lose height until your helicopter floats above the ground. Then just strafe to your left or right, butchering large groups of enemies and this achievement will pop up in no time.
Use the following video for an idea of how its done:
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