Batman Arkham Knight: Batmobile Weapons Guide, Armed to the Teeth [PS4 - Xbox One - PC]
Let's turn the Batmobile into an unstoppable war chariot.
Trophy Guide / "Armed to the Teeth" Objective
The Batman Arkham Knight Batmobile can equip 5 different weapons in total:
Vulcan Gun (machine gun)
Drone Virus (Consume an energy bar, destroy enemy tanks for energy)
EMP (Consume an energy bar, destroy enemy tanks for energy)
Missile Barrage (Consume an energy bar, destroy enemy tanks for energy)
The good news is that you don't have to do anything special to get them all, but it will be enough to get beyond the second half of the game when the last two weapons, the EMP and the Drone Virus, are automatically unlocked and equipped.
When you have them all, to unlock the result, start an AR challenge with the Batmobile and use them one after the other on the same tank as shown in the video above.