Batman: Arkham City "Gotham Base Jumper" Trophy/Achievement [HD]

If you already passed the game, you can return to the Wonder Tower by entering the "Arkham City Processing Center" which is South West of the "Wonder City" structure. If you have not, I think you will have to wait 'til you reach that portion of the game. Note, you CAN NOT glide into the city from this building. It will just loop Batman to shoot his grappling gun to return to the tower. Use the blimp as your guide to continue gliding until you get the trophy.