It's horribly glitchy. Got it today, after being told I had 2/3 for the lumberers (Godfrey and Terry) but that their log was complete after scanning anything new.
Got it after spamming "Sequence 6 -> Abort Memory -> Run to their mill and hope for something new".
Good luck to anyone else going for this ach, cause its buggy as... "insert similie here"
Seriously Judgmental: 2013/03/26
DR3 + DLC 100%: 2014/07/11