https://www.gamespot.com/articles/get-free-fortnite-battle-pass-tier-by-doing-secret/1100-6460783/

Season 5 of Fortnite is here, and there are already an assortment of challenges for players to complete. Just like last season, finishing all of a given week's tasks will complete a corresponding Road Trip challenge--Season 5's equivalent of Blockbuster challenges. These, in turn, will reward you with a special loading screen, each of which contains a subtle hint leading you to a free Battle Pass tier somewhere around the island.

Clearing one week's set of challenges will unlock the first special loading screen, which features a group of characters atop a grassy hill near the giant Durr Burger. Two appear to be posing for a photo while another looks at a map of Lazy Links, the new golf course area introduced in Season 5. You can see the loading screen for yourself below.