This achievement is part of the main story missions and is unmissable
*** Spoiler - click to reveal *** At one point in the mission you have to clear Founders Island from the radar and missile system the Arkham Knight has built there. To do so you have to fulfill some tasks first.
Firstly, you have to highjack one of the flying drones. Do so and you will be able to deactivate other drones via your remote hacking device.
When you have this ability you have to go to two radar devices and destroy them. Afterwards you can go to the missile control cenre. Eliminate the thughs there and enter the control room.
Secondly, you have to bring the batmobile to founders Island. take out the heavy tanks and follow the mission markers. You will come to some sort of bridge. Use your batmobile to pull this bridge up a little bit. This will cause a cut scene and you' ll have to fight the Arkham Knight and some of his goons. Do so and you can turn of the protection of the missile device again. Switch to your batmobile, take the jump over the gap and destroy the missile device with a couple of shots. Be prepared to evade some missiles if necessary.
The achievement will unlock afterwards
If you need further help, refer to the video below:
(Video Credit: GamerrZOMBIE - High Quality Videos even Higher Quality Gameplays)
Hope this helps you guys :-)
Any improvements? Let me know in the comments below!