They need to change what counts towards the "Tankless Job" achievement. They need to include the roulette's, but only with the bonus so it will still take a while to do. There was a time where I stopped doing the expert roulette's because:

a) it didn't count towards the achievement
b) T4/ex primals was way faster and easier to farm and gave just as much as the roulette over a period of time
c) I had no reason to do the expert since I already cleared it and I didn't need more Mythology (tomes at the time)

I'm sure they won't reset the achievement since it would piss off a lot of tanks. Imagine being 199/200 then when HW hits you are back at 0/200. I'm guessing the Dark Knight's mount will be mechanical since it is in Ishgard. I'm hoping its this: