Use this :http://achievementhunter.com/games/guides/brutallegend/
1.) Use the check marks at the bottom to keep track of which ones you have and which you don't
2.)If you have to leave your comp/360 for a bit but have not gotten all the items on a map section and fear that you'll lose your progress, just Print Screen and copy the images to a paint file so you have a record of which you have!