Here's a very extensive map-based guide, courtesy of GamePressure.com
•If you're missing just a few collectibles in an area you can simply scroll down and click on the area and type of item you need in the Table of Contents(Right side).
•Say you know that you are missing Document 20
in an area. You can then scroll down past the map and it will list the documents in the order that you should find them. Go down to 20
and there will be a picture, along with some text to help you locate the collectible.
•Included in the guide is also text/picture solutions to each of the Challenge Tombs.
Have fun raiding!