Not sure how exact this is, but I noticed after I had already gotten the History Badge, "Lorekeeper", this was after I had gone to all the historical plaques. I got that badge, but later I went and checked the plaques in Cap Du Diablo again, in a different order, and I received a second historical badge, "Technofreak". I started with the plague at the PTS, then hit the plaque at the bottom of Mt. Diablo, then I went to the Plaque at near the egghead badge marker. Then I went to the one in Devil's Coat Tail's. If you do that, you should get the badge. I got it on two toons doing that.
