I recently got Fable 2 for free off of the game marketplace, i got a message from a friend saying that it was free so i went ahead and downloaded it. I started playing it and it came up saying that i had got an achievment but i had to download part 2 for 960msp to get the achievment. Does this happen with the game you buy or is it just happening to me because i got it free because of microsofts 'glitch' with the download.

P.S. You cant get it for free anymore

Thanks alot!