To unlock the "MISSION COMPLETE" trophy in Detroit: Become Human, you must allow Connor to be hacked by Cyberlife in the final mission "BATTLE FOR DETROIT". If you break free of the hacking attempt you will get this instead:
You should make sure the following incidents happen on the way to the final chapter to make the requisite scene much easier to reach:
If you follow the steps above you will receive the trophy after the final credits when you reach the flowcharts.golden_eternity
reports that if you are looking to get this later outside of a full playthrough, you can go back to the "Defend the Barricade" checkpoint in "Battle for Detroit", play through from this point and make sure to stay in the Zen Garden.