This question contains a bit of a spoiler, so if you haven't yet seen the credits read no further.
I just got the credits in the game, completing the mission where you take out the three targets with the three guys.
But, when I go to the start menu it tells me I've only completed like 38/67 missions? What else is included in this count? I presume the "?" missions aren't.
Best Answer
There are several missions that are included in the 67, that are not required to complete the Big Score. The ones I know for sure are Lester's assassination missions.