You must complete these chapters on insane difficulty. Or... You can play up to the last level on each chapter and then quit out, select continue and change the difficulty to insane. In effect it cuts your work down a lot. It will still be quite hard though as the bots are godlike and can teleport anywhere and can dodge like hell.
Full list of missions here:
GUIDE AND LIST
NOTE: There are some parts where you can choose of two missions and depending on which order you do the missions, the final mission of each chapter WILL be different than someone who took a different path. Chapter two has a total of four different missions that could be the final one. The other chapters may also have a different selection. Follow the guide above to be safe if you're using the difficulty changing trick.