Pinball FX2 is now available for download for the X1. Any tables which you've purchased for the 360 should be free to download for the X1 as well. The main game is only 1 table worth 1000 gs, and all other tables have 1 achievement each, worth 0gs. I don't know if this will apply to all tables going forward, or only the ones that were originally on the 360. Many of the threads I read sounded like Zen didn't really know the ins and outs of the X1 achievement system, and were worried about running out of achievements like they did on the 360, which would explain why there's only 1 achievement per table. I don't really understand the 0gs achievements either, unless this was the only way they could get MS to agree to not charge for the tables again for people who had previously purchased for the 360. Regardless, enjoy your next gen pinball!.
That twitter post doesn't mention whether it's for the 0gs achievements, or the issue going on with XBL right now where no achievements are popping for any platform. I tend to think it's the latter, but I guess we'll see.
Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete.
Otherwise, please post a new thread in this forum instead.