The SP weapon attachments are at 13/15 for me, I don't know if two ghost attachments were added in the update or my T.V. is retarded and lying to me.

If anyone knows of a fix post it or telepathically communicate it too me because I really want 100% completion.

Also for your enjoyment because you skimmed text.(I got bored and made a gif):

I'm having this problem too guys, I'm pretty sure it's a glitch and I don't know which ones I need.

Somebody answer him!

Probably a glitch that was created from fixing the other attachment glitch.. Either that, or they added two new attachments that I haven't seen.. I would guess it will be fixed in the next patch..

It's a glitch. You have all the attachments because there are only 13. We all have the same 13/15 problem. They fixed the attachment unlock issue and then didn't test at all apparently because they didn't even notice that they once again made it impossible to get 100% completion.

Well one of the ghost ones is probably the Hologram, since it's not in SP, I guess it was cut but now you can't get it. The other I have no idea at all, that should be everything. Maybe it's like this now as a result of fixing the Suppressor. Sure 100% would be nice, and I hope they do fix it, but I can live with my 99.something% if it means I have the Pistol Suppressor.