Shut Down

Shut Down is an Achievement/Trophy.

Obtaining
During one of the very first story missions of the game, you will meet "Nigma" while inside the Coventry Radio Tower. After destroying the satellite jamming device at the top of the tower and exiting the roof into Gotham City, your world map will become populated with small yellow sound wave icons that represent Network Relays.

Now that you are free to roam around Gotham at your own pace, you can take this time to make your way to each of the Network Relays in the Coventry district. In order to destroy a Relay, simply throw a Batarang at it. Once all ten have been destroyed in this district, this will unlock.