I'm looking into this one as well.
Trying to put together 4 people, so we can grab all of the multiplayer achievements not just the whole lot except 1.
Pm me in game or here and I will start a list:
1. THE DEADLY DOG
You have to get on the train in the beginning when things are still changing and everything is rough, unpolished, and incomplete in order to enjoy the bliss found at your stop.