Though it is missable, you can just load up your last save after completing the game to get this if you forget. Make sure not to start a new game however as it will erase your progress in the episode. *SPOILERS* At the end of the game, when you are in the temple, talk with the guard. You will get a journal update that is the last of the game. When it pops up, just use the back arrow to scroll all the way back to the first journal entry of Episode Two. The achievement will unlock on the first entry.