New, New, New Collections! More scavenger hunts, new items, and more with the 9/9 update. Dulfy has posted a collection guide to any enthuiasts. The collections can give you exclusive backpack items, achievement points, and more. For more information on the feature patch, check the earlier announcement post.
Dulfy's Collection Guide:
http://dulfy.net/2014/09/08/gw2-items-collections-guide/