Gears of War Glitches

Casual to get Insanity achivments.
For each chapter you only need to play the beginning and last checkpoint on Insane. This does not affect achievements. Just remember to change back to Insane before you get to the last checkpoint in the chapter. I also DON NOT mean Acts there are like 5 "chapters" in each "Act" you probably already know but I'm making it crystal for you.