Load up the GoatZ Map Before Outbreak
Head out of the spawn and make your way down to the Whiplash course which is pretty unmissable but is located at the beach where the slides are.
Climb the ladder at the back of the course to begin, you will need to not hit the water and make it all the way around.
Using Double Jump and Slow-Mo can help of course.
Achievement at 5:23
This might take a few attempts and can be frustrating.