At the end of a squence before returning to your room you will need to speak with Lucy, all in the SAME playthrough, so make sure you don't miss any or you'll have to start a brand new game. Now keep talking to her untill she keeps saying something about going to bed, or getting rest, or she has to go. I always just kept talking to her till she was repeating herself
These maps show the rough location of each mission so that following these will allow you to play through the game without climbing any View Points, except the mandatory one in the Kingdom.
Since you only have to do 2 or 3 investigations you can go the whole game without doing a single Informer mission. In most opinions the easiest ones are Eavesdropping and Pickpocket. Interrogation is really easy too but will require patience so many suggest the other two if you really want to get it done quickly.
I can not take any credit for this just wanted to pass on this great guide for anyone looking to do a speed run for this. All credit goes to Mister Dakhttp://www.xbox360achievements.org/forum/showthread.php?t=55...