Near the end of the Tour, you will be in Africa. The last event in this region, is called "Kilimanjaro " and they recommend you use a headlamp of pulse goggles for the event, because of the darkness.
Choose this event, and make sure you are NOT wearing a headlamp of pulse goggles. You should have a very low survival probability (4%).
First thing, make sure to adjust the screen brightness on your television to the max setting! Adjust the contrast/colour ratio to something that will help you "see" in the dark. This alone will make everything much easier. Just take your time to get to the bottom. Also, grind as much as possible by holding LT. If you grind the side of the crevice and don't jump you eliminate the chance of yourself falling as the game will basically steer for you. Jump make sure to time your jumps when getting off the side of the pathways. Avoid jumping or boosting without reason. Also, you are allowed 3 total rewinds, if you ever take a nasty spill, and they will not prevent you from attaining the achievement.
Note: Don't forget to remember your old television settings and change them back when you're done!
See the video for a better explanation of what to do and where to grind!