Week 2 doesn’t reward you with a secret battle star for completing all challenges and instead gives out a Secret Banner unfortunately.
To Unlock the Secret Banner for Week 2 in Season 6 you need to complete all challenges for any 2 weeks.
Youtube Playlists (Season 6):
Season 6 Challenges
Fortnite WEEK 4 Dance on top of Clock Tower, Pink Tree and Giant Porcelain Throne (Season 6)
Fortnite WEEK 4 Finding All Shooting Gallery Locations (Season 6 Challenge Guide)
Fortnite WEEK 4 Door Bell Locations (Season 6 Challenge / Best Door Bell Landing Spots)
Season 6 Secret Battle Stars
Secret Banner Location WEEK 4 Fortnite | Season 6 Hunting Party (Secret Battle Stars/Banners)
Secret Battle Star Location WEEK 3 Fortnite | Season 6 Hunting Party (Secret Battle Stars/Banners)
Secret Banner Location WEEK 2 Fortnite | Season 6 Hunting Party (Secret Battle Stars/Banners)
Season 6 Map Changes
Chiller Trap Trick to Travel Faster in Fortnite (Fastest Sprint Using New Freeze Trap in Season 6)
First Floating CUBE SYMBOL activated by Cube Island | Fortnite Map Updates Season 6
CUBE ISLAND is Moving in Fortnite | Season 6 Changes (Loot Lake is Traveling to New Destination)