Just went to my shop, in which I had maxed out the shop till achievements years ago and was granted the achievement for having 500k in my shop till at one time. I thought the purpose of sitting idly on the import page was that all the achievements I'd previously earned got counted and applied. I read Keith's post referencing the difference in the old achievement numbers to the new ones, where apparently only the first tier count towards your total, but I hadn't seen anything about having lost already earned achievements.

Is this something I should track down a topic for and report? Because I don't think I saw anybody else report this thus far (though comprehensively following long topics on my iPad is a task sometimes beyond my morning awareness), but it seems like there are quite a lot of topics and I'm not sure which one(s) this bears mentioning on, if any. Orrrrr, if anybody has any information on the issue...?

Yes this is happening to others as well. For now, I recommend leaving it be. Any items you get from achievements that you already have should be set aside (so they can be deleted), but I'd wait a day or two to give them a chance to clear up some of the bugs. I checked the bug forum thread about achievement bugs, and this has been mentioned there, so they know about this glitch.

You can try to reimport your achievements again. I had to do it about 6 times, and i'm still not sure if everything was imported since, this morning, we seem to be missing pages worth of achievements so we can't even check to see if we have them.