Some of the 65 builds will be forced to be completed to advance the main story. Ones that are confined to special assignments do not count towards this 65. Not counting the special assignment builds, you will need a grand total of 1,414,000 bricks.
This video shows all 65 being built, in case you need the visuals to help, they dug me out of going in circles a couple of times. Again, even though the video includes the super builds from the special assignments, these DO NOT count towards the achievement. (You have to complete them anyway to get through the story so they'll get done regardless)