I found this guide by IGN to be the best.http://ie.ign.com/wikis/condemned-criminal-origins/Birds_and...
My only problem was it lists the birds and metal seperately, so I used it with the guide chOsen1337 posted to get an idea of roughly what order they were in.
The level walkthrough has a list of all birds and metal in order, so if you would prefer to use that, I have provided the link below.http://ie.ign.com/wikis/condemned-criminal-originsAngrymagnox said:
For the record, the progress for this collectable is held on your profile not the save file.
Something I noticed was that if you die after collecting a bird you have to go back and collect it. I think it does not 'stick' until you get to a checkpoint. Also my achievement popped mid level, there was not requirement for me to finish the level. This confirmed to me that the achievement it is tied to your profile, not your save file (my previous save was deleted)