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The Paving the Way achievement for Fallout 3 is worth 20 G

Once youve been debriefed on the mission, talk to Morgan and hell give you some items that youll need for your squad, now head over to the terminals and choose what you want your squad to be, youll need to use both of the terminals before youre allowed to leave.

Now head North-West toward the goal that states you have to destroy 2 fuel tanks, once you get there just plant explosives on the 2 tanks to finish up this part of the quest, after that youll get warped back to the room you were briefed in earlier, choose another command set at the terminals and prepare to leave.

Now head up to the Listening Post, be careful though, there are loads more enemies in this area and some will have heavy weapons like rockets, theyre not hard to take out, but its easy to die here if youre not careful. Follow the train track and go through a broken building, youll come to a set of stairs, head up them and enter the building.

Once inside just follow the path all the way though killing enemies as you make your way up to the top, when you get up there youll clear the quest, get teleported back to the briefing room again and the achievement will pop!