Finally managed to unlock the Mecha-Gnome race. I recently reactivated to check out Dragon Isles and noticed that all I had left on the achievement was to run the final dungeon. Then I noticed that all you REALLY had to do was say that you finished the dungeon. Apparently after you accept the quest from the prince all you have to do talk to him again and claim that you did it. I spent a couple hours trying to solo the place on my Druid before returning to check out some strategies and discovering this. It was quite the relief and after running the remaining short quest line of running around Mechagon, I had the race unlocked. I've always enjoyed the hunter class so now I have some DPS work to do while waiting for rested exp to build back up on my new Druid (moving servers, again).