100 Day Achievement
If anyone owns this game there is a really easy way to get the 100 day achievement. Or so ive been told.
Create a save, then you disconnect from Live, then move the clock on a year, and then when you start the game back up. Hey presto achievement unlocked. There is a nice 200 points for you. I dont know if this works as i don't have a Japanese console but i guess you could try it out.