I just found out that Grand Theft Auto IV only has 60% of the main storyline missions, that’s the entire game right there. Right now, I’m 52% into the game. So that basically means I’m “almost” done with the game. I have at least 20 missions left and then I’m done.
I just completed a mission called “Catch the Wave” today and it wasn’t that hard of a mission, only took me several tries to beat it.
I should definitely have the game beat sometime this month.
Kev
K'Brocking 
I’ve just achieved 60% and hardly found any of the missions challenging. Sad that I waited that long just for a game with nice graphics, what about the storyline and everything else that has been forgotten?