OK, all you "haven't played Until Dawn yet" assholes. I'm about to save you hours of frustration. Hours! HOURS!! (That is, assuming you thought you could play your first run without reading a trophy guide for fear of spoilers. I read you could play, then chapter select afterwards for trophy clean up. Ass-munch should have mentioned this little nugget I'm providing here. The guide that Vig provided here did mention not shooting the squirrel, but I read that too late.)
Do Not Shoot The Squirrel At The Beginning.
If you read this and DON'T heed my warning, then you deserve what you get.
I thought I could fix it, but unless you start a new game and lose all your collectables, your screwed unless you play the game from chapter 1 till the end without stopping. If you stop, it reverts to your previous choice. Learned that the hard way last night. I'm done. Game goes back to Redbox.