This achievement will be unlocked early in the campaign, and is unmissable. After you complete the Resistance Communications research, you will receive the objective to make contact with the "Blacksite" region. Take the Avenger there, press
over "Make Contact," and wait until the timer has counted all the way down. You may get interrupted several times by Tygan, Bradford, the Spokesman, or other people. If you have to go do something for them, take care of it, then come back and finish making contact. Once you're done, the achievement will unlock, and you will have a new objective.