Ive completed the game, how do i go back and get all the view points and flags, every time i go on continue game it takes me back to the end then the credits. help plz

Wait until the end of the credits and then put Desmond back in the Animus. Make sure to load the correct memories for the sections of the cities you want. I don't think continuing after the credits will save where you were in the memory after you reload it though if you don't complete it. It's pretty half-assed.

Is that the only way? thats rubbish, its almost not worth it, having to keep going through the credits and having to watch the cut scenes again