This guide is for anyone following Peace In Our Time, you can actually get both of these with a simple hard-save.
Following the previous achievement, you want to:
* Divert power to Edgewater
* Convince Deserters to return, leaving Reed in charge
* Turn in Phineas to the Board to start working with Sophia
* Progress story until you resolve the Radio Transmitter and the UDL ship crashes
At this point, Signal Point in Space will change and ask that you return to Sophia. Before you do, head to Edgewater, up the elevator to Reed's office and kill him and his two bodyguards. The rest of the town won't even notice. Now when you talk to Sophia, she'll say that Edgewater is in shambles and need you to activate the Termination Protocol Foundation mission.
This achievement will pop as soon as you clean up the final robot.
As a bonus, if you're going for the 3 Negative Faction achievement, killing Reed will immediately give you 100% negative Spacer's Choice. Killing Sophia will give you 100% negative Board, then you're likely close to negative with either MSI or Iconoclast. If not, Roseway is a good choice as I'm guessing this isn't your ideal save to continue the story anyway.