*Missable*. As it says, finish the game in under five hours. Should be the last achievement you get, on the second play through. Once you’ve done the game once and know what to do & where to go, do it again without going for bonus points or examining unneeded objects. Also, when you get cut scene videos hit Start and select "skip video" to save time. You can check how much time you have left by saving your game to see how much you’ve used up. The achievement pops when you reach the main menus AFTER the final cut scene video AFTER the unskippable credits. Therefore, try and make sure you have some time in hand before finishing the last part prior to the credits. Good luck!