The Golden Compass

This is story related and pretty straight forward. All you have to do is complete the game. It doesn't matter how many Alethiometer questions you answer or symbols you collect. The game is pretty simple and made even easier by all the other guides for it here on trueachievements.com so you should have no trouble beating it in one day, though it may take you into a second day if you go for all the achievements in one playthrough.