Edit: The film I used, 'The Art Of Getting By' appears to have lost some of its star rating and is now only 4 stars.
I'm afraid you'll have to look through the more popular titles until you find one with 4.5 stars. Then use that instead. My film above took less than a week to lose the rating.
If you find one, post in the comments so people can try there first.
When you find a film, Immediately fast forward the film at x128 speed to the end. The load it up again and repeat until you get the achievement.