The Chill in the Air

The Chill in the Air is an Achievement/Trophy in Batman: Arkham Knight, as part of the Community Challenge Pack DLC.

Obtaining
Complete the Crime Alley AR Challenge unharmed as Batman, Nightwing, and Robin.

Focus on keeping yourself unharmed, first and foremost. You don't need to worry about getting a high score with gadget/attack variations or Flawless FreeFlow, so don't worry about that. Don't try and do Ground Takedowns unless it's on the last enemy, since they leave you exposed. Similarly, Beat Downs also leave you open, so save the Brutes for last. Being good at Blade Dodging (and doing the Blade Dodge Takedown) helps a lot, as doing KOing charging enemies with your Quickfire Batarang/Escrima Stick/Shuriken rather than just dodging them.