Totally agree on the defeat badge order. You will totally knock out a majority of the defeat badge requirements from getting other badges (tfs, story arcs, etc). If I had to pick an order, I would do Exploration, History, AE, Day Job, Consignment, Ouroboros, Invention (assuming you've built up a nice bank of inf), Event, PvP, Accomplishment, Achievement, Accolade, Vet Levels and finally Defeat/Gladiator. That is more or less the way I did it, but I didn't go out of my way to not get badges from the order/category.