Thanks a billion for sharing!
Now I know I will have to hire someone.
What will you do, will you hire someone to add achievements support to your game too, or leave it this way?
I think every game dev planning to release their games on Steam should share this C2 > Steam process details, so we can find a solution together.
I would happily share the costs for a C2 plug in, if someone here think he's able to make it.
(I already have 2 games I worked on on Steam, but it was made with XNA, and I didn't handle the code on it, so I don't have a clue on how to do so)