This one is fairly simple, just requires some quick finger work.
Ziplines are all mounted on tall poles, with the line attached about two thirds of the way up.
Climb all the way to the top of the pole, so you are perched above the zipline. Jump off in the direction of the line and immediately deploy your parachute.
When your parachute is out, quickly let go. If you've been following the zip line, it will be directly beneath you and you'll latch on and slide down.
The trophy lags a little bit, so it may not pop until you land off the line...