An exciting aspect of Fortnite's Alter-Ego challenges is that you have to complete particular tasks to unlock new styles for skins. For each, you need to hit a particular Battle Pass tier to unlock the base skin, then complete the required number of missions and complete the unique challenge while wearing the standard version of the skin. To get the Hazard style for the Journey skin, you will need to climb the highest mountain in Fortnite, while you have the Journey skin equipped.
The Journey skin unlocks at Tier 1 of the Battle Pass, and in the second stage of the challenge to get the Hazard style you need to complete three missions. This means completing all the challenges in a single mission and getting 100% completion.
You can find the tallest mountain in Fortnite southeast of Lazy Lake. This massive edifice is impossible to miss, but it can be tricky to figure out how to climb if you've never been there before. The easiest way to do this is to use your glider when jumping off the Battle Bus. If you prefer not to, go to the red arrow on the map above and begin your ascent.
Follow the path marked with red flags to the top and the large red flag that marks your victory. You should also find a chest and some frozen loot. Once there, you will unlock the Hazard style. Again, be sure to wear the Journey skin while you complete this challenge.