Detective Butler: Maiden Voyage Murder

When you complete the game the whole way through, bonus content will unlock. To get to it, start a new game, and then click Bonus at the bottom of the chapter selection. It is important to ensure that when you go through the art section, to click on each option and view each one or the achievement will not pop. When you've gone through it all, just click through the rest of the bonus content, and the achievement will pop.