A little ways up the mountain, you will run into this scene


Now, the first step is to set up the zip line.

This is not that hard, move all the way to the left, then wall jump off the wall and and the crest of the jump, fling a piton towards the platform on the right. It will land either on the side, on top, or just behind the platform. Climb back up to the left wall and place a pliton there.

Congratulations, you finished the easy part.

Now, simply slide to the platform, careful to not run into the sweater. Jump for the money.


Then go back and jump onto the sweater. This will give you a jump boost, so be ready. Do not try to land on the sweater again after jumping onto it. This will kill you.

Now just keep on jumping onto the sweater.


Take care to go back and forth. Once you jump on the sweater, if you hit it for a short period, it will kill you instead of staying knocked out. This is always the same, no matter if you correctly jump on top of it or not.

Just jump onto the sweater 15 times for the achievement.