FORTNITE Chapter 2 Season 3 Week 10 challenges complete guide and unlock gold eternal knight

All challenges done as well as unlocked Gold eternal Knight style.
There is an index in the video description to jump directly to the challenges.

Search 7 chests at The Authority
Deal damage with shotgun or SMG x 500 and 15,000
Collect Fireflies from Weeping Woods x 5
Get 3 Eliminations at misty meadows x 3
Dance at Apres Ski dance floor for 10 secs
Destroy shipping containers at Dirty Docks x 7
Unlocked the Gold Style Eternal Knight