For this trophy, you'll have to find the hidden white page within the world which is necessary to get the YES!!! achievement. Here's how to grab it.
*** Spoiler - click to reveal ***This puzzle can be solved by yourself if you want by finding the two torn pages in Channelwood and Stoneship. First, make sure to turn on all the marker switches on the island. There are 8 that aren't too tough to find. They're predominantly located next to areas with linking books and most of them can be found upon starting up the game (though you'll have to complete the Mechanical Age puzzle to turn on the final one on the island). Once all eight switches are turned on, return to the dock where you started the game and turn off the switch here. The switch will open and you'll get the white page and this achievement.