Shields Up! Achievement in Halo: The Master Chief Collection

On this map, the central dish structure provides a temporary energy shield when activated by one of three switches located around the boarders of the map. The first of these switches is located inside Comms Tower, the second is located on Sky Bridge, and the third is located on the center ramp where the Shotgun spawns.

The energy shield will usually only last about thirty seconds, so make sure to move towards the switches around the map as soon as possible. Also keep in mind that this must be done in matchmaking and cannot be unlocked in a Custom Game. Once you’ve activated the energy shield three times, the achievement will unlock.