Yes, I've watched the youtube vid for doing this in the 1st section of the 1st chapter but failed on numerous occasions to actually get it. I finally got it in the last but one section of the same (1st) chapter...
Just as you enter the teahouse turn left & go up the stairs to your left, diving & shooting the 1 or 2 guys as you go up. Turn left at the top & dive & shoot a couple more guys then do a U-turn & groups will start to come out of the door in front of you (door on the right @ the top of the stairs). Keep diving backwards & forwards shooting these groups.
After 2 or 3 groups you should be up to around 42 stars. Jump on the banister to your right & onto the light/swing & finally shoot 2 or 3 guys on the opposite balcony... Achievement unlocked.
This method took 2 or 3 attempts to get right whereas I had attempted what I had seen in the Youtube vid (& failed) many times.
Hope this helps all you people who are as crap @ shooters as I am.