During the "comes the power" quest on Edgewater, direct all power there and take the Botanical Gardens power cell.
Then you need to convince the workers to return by completing either "The Frightened Engineer" or "A few kindred spirits", once you've got them to return, head back to talk to Reed. Leave him in power and continue on your way.
Tell Udom that you want to turn in Phineas on Groundbreaker, then follow "The distress call" and get all three pieces of research (one won't be able to be gained if you have 'below average intelligence'). Return to her and buy Udom's seal back, return it to Udom and then head to Byzantium to meet Sophia.
Work with her and go to Monarch. Shut down the radio signals in "Radio Free Monarch", DO NOT return to Phineas before this trophy unlocks, otherwise it voids it. Follow the Sophia's instructions until she talks to you about Edgewater and how you saved the town.
Trophy pops.