I would advise to set this achievement aside as a "lone unlock" as with all things, it is hard to collect all of them and still make a decent grade. For those who enjoy a text/picture guide, this should suffice
http://www.ign.com/wikis/metal-gear-solid-5-ground-zeroes/X.... and for those who would prefer a video, here:
I do hope these help, enjoy and let me know if you have any suggestions in the comments!