I forgot to mention, The Hunted challenge is bugged. I would advise against playing it right now.
Hinterland is aware of the issue but it seems they've been concentrating more on Wintermute lately and not fixing bugs.
As a matter of fact, with the 1.46 update they've introduced some pretty serious bugs.
If you store anything in the red toolbox at Spence's, you'll lose it when the face of the toolbox disappears, and it will. Similar thing with the filing cabinet and chest of drawers at the Mystery Lake camp office.