Having finished the story I went back to get a lot of the collectibles. Unfortunately, certain treasure chests and other collectibles do not appear despite being indicated on the world map. Thus, I think it may be impossible to "platinum" this game. Also, I now experiencing a game-breaking bug that will not let me load my game. The game just restarts when I click on "Continue Game." I have not been able to confirm whether this problem is unique to me. So, take that into consideration when making a purchase decision.