I don't mean to be corny, but any info on these?

When i hit play in steam to run the game nothing happens. Is anyone else having this problem???

Does anybody know how to get the stubborn achievement. I seem to have missed it.

At the end of a level, it says an upgrade is available, so how do you do upgrade?

I had three starred every mission but the achivement isn't working. This may be due to my 2 starrring a mission as general but then I did the mission as private 3 starring it. The game however for some reason doesn't accept the new rank.