Here's a video for all of the AR Challenges, if you're having any trouble follow the vids below. Good luck!
Combat ChallengesCombo MasterTower DefenseAzrael's AtonementGotham KnightsPredator ChallengesSmash and GrabTerminal VelocityRevive and ShineUnder the Pale MoonlightBatmobile Race ChallengesMidnight Fury ItCity Heat ItCrushonatorCondamnedMental BlockedBatmobile Combat ChallengesUntouchableOne Man ArmyNatural SelectionSlumdog BillionaireBatmobile Hybrid ChallengesSeek and DestroyKnight Time StrikeRoad RageBig Game HunterDavid and GoliathDrone Zone