I have two problems, both of which I've seen mentioned on TA.
Firstly; I have two achievements (Story Complete I and Hyper Shopper) which are unlocked in the game but just won't unlock on XBL. I think this may be the two getting the getting two achievements at the same time problem.
Secondly; possibly this is just me doing something wrong BUT someone on TA has the same problem:
I have completed several days on Fuji; all customers were served with no mistakes and all left with 5 stars, all products were sold but I only got Expert and not Perfect. I've done some of these levels several times.