Gore Packs can be purchased in the shop, and you will need to buy most of them for other achievements. Hallowed, Death By Chocolate and Free Falling are not required for achievements, so don’t bother buying them! You will start with a few, so only need to buy four more for this achievement. You can replay any movie or scene to grind coins, but will probably be most if not all of the way there by the time you have finished all movies.