Edit: I see a lot of people having an issue with the shooting game. I've managed 10/10 by staying fairly far to the right with the mouse, and practicing roughly where they get thrown. There are only 3-4 different "lines" the item can take when flying through the air, so you only need a few target spots.
I suspected it was something like that, but I wasn't going to take the time to figure it out. I was disappointed that PB included such a thing in Risen 2. It's really not their style, and the same goes for the QTE traps. If it wasn't for those things and the exclusion of swimming, this game would have been very close to a 10/10 for me.
Hopefully they drop that sort of thing for their next title.