We learned that you can go really fast if you boost out of the corners. You may lose a passenger or two though.
— In-game description

Track Record is the third unlockable loading screen in Season 5. To unlock you must complete all challenges from any 3 different weeks.

Track Record actual - Loading Screen - Fortnite

Secret Star

Located in the southwestern area of the J2 map grid on the Battle Royale Map.

  • Reward: 10 Battle Stars