https://www.gamespot.com/articles/fortnite-challenge-guide-visit-corrupted-areas-sea/1100-6462271/

We're now in the second week of Fortnite Season 6 and with a whole new Battle Pass that means there's plenty of new cosmetics to unlock. One of the ways to do this is by completing the weekly challenges and to make that a quicker easier task, we've got a breakdown of everything you need to do. As with the previous season, challenges are split into two categories, with one set available to everyone and a second set exclusively for those that purchase a Battle Pass. Complete the mini-quests and you'll earn Battle Stars that level up your Battle Pass to unlock rewards.

In the free section you'll need to use a Shadow Stone in three different matches, complete stage one of a multi-part challenge by dealing 200 points of damage with an Assault Rifle, and visit all of the Corrupted Areas (more on that below). In the paid Battle Pass section the challenges all involve getting into combat, with one asking you to kill an opponent from at least 50m away, while another requires you to take out three players with an SMG. Take a look below for the full list of challenges.