Have found some video for people struggling with the game. It's for the PC but is easy to follow.
You will still have to follow the collectables guide as it doesn't cover them in detail.
Part 1 is missing but is fairly easy anyhow.
Part 2 starts at the elimination events at the olympic village
Just found out the last video is only upto 80% game completion.
However i used this thread to figure out the last bit. http://www.xbox360achievements.org/f...d.php?t=138301