Would like to add here having recently done world completion that I personally had problems with Swift Arrow located in Caledon Forest and Restless Arboreal Spirit in Brisban Wildlands. Trying a method of a comment mentioned above, unlocking skillpoints through WvW has allowed me to get past Swift Arrow's completion but somehow misses the Restless Arboreal Spirit completely. On my map progress all i need left is it, and if I try to unlock skill points the WvW method, consuming the item just turns it into a Proofs of Heroics.