When reading books on the website, iOS and Android versions of Epic!, a child can earn badges and achievements for the books they read which unlocks new avatars, themes, and frames!
On iOS you will need to read in full screen view for the read time to count towards badges or reading points. To get to full screen view, just zoom in once using the pinch gesture until the book takes up the whole screen and there is no colored border around it.
Note: The books read count toward total books read, as long as they press the "Finish!" button at the end of the book.