Collect All Artifacts
I was going to upload screenshots of the Digital Strategy Map but someone over at Xboxachievements.com has beat me to the punch. So all credit goes to xxJustinxx who posted it there.http://www.xboxachievements.com/forum/showthread.php?t=57847...
I also wanted say that not all of the collectables are not in the place they are shown so I will point out those I noticed.
Baptism Ghost Graffiti - It is shown in the Church map but it is located in the Mental Hospital when looking for Iris. Its in the laundry room near Iris's room above some washers.
Pillary Ghost Graffiti - It is not on any map but it is to left when leaving the Mental Hosipital. It is located in the area after the Theater. You turn left and its near the windows.
Buring Ghost Graffiti - It is shown on the map near 'In Her Hands' and Katy Side mission but it is actually across the field to left when looking at 'In Her Hands'. It is near a picnic bench on the wall.
EDIT: As other gamers have stated you can pick up collectables you have missed on multiple playthroughs.
EDIT 2: Some achievements are not popping when going for all collectables.
If any question or reason for negative feedback please comment to make the solution better.