https://www.gamespot.com/articles/fortnite-season-5-challenge-locations-jigsaw-piece/1100-6460362/

Season 5 of Fortnite: Battle Royale on PS4, Xbox One, PC, Nintendo Switch, iOS, and Android is in its final week of challenges. As with the previous seasons, this one brought with it a selection of fresh challenges to complete on a weekly basis, as well as a variety of Battle Pass rewards to unlock for your efforts. This time, however, Epic has made a few tweaks to the way certain Battle Pass challenges operate, including the introduction of free challenges for all players. Before the season ends and previous challenges are no longer available, we've got details on all of the ones available so far through Week 10, and exactly how to get them all done.

Once again, players who purchase the Season 5 Battle Pass will get a set of objectives to complete every week, which in turn will go toward leveling the Battle Pass up and unlocking new rewards. Unlike past seasons, however, weekly challenges are now divided into two categories, Free (which are available to all Fortnite players) and Battle Pass (which are reserved for those who've purchased the Pass). That means that even if you haven't bought the Battle Pass, you'll still be able to complete certain objectives and earn rewards.