Originally Posted by Fishman
Not being mean, just for future reference it's frowned upon to bring this old of a thread back to life. You could ask a question like this in the achievement guide (stickied at the top of the forum).
Taken from the guide:
To sum up; choose option C and nothing will be missable. You can go back and get all 6. So yes, you read correct. Just enjoy the game!
As the thread wasn't locked and from reading through the original answer hadn't really been answered I thought I was safe. Oh well, at least I didn't start a new thread!