I'm working on the Treasure Hunter achievement now, hoping to get all my upgraded equipment before I tackle Mission 64 and also the Long Gui. Farming for gil is very smurfing tedious. However it'll only be another handful of hours (I'm doing it in a consistent but less efficient manner) and then I'll have everything ticked off. I've been watching anime while repeating the A Potent Sting mission (23 or 24 or something)