Quoting awleach, reply 2yes there is an overall progression in steam, (like 26% of all achievements are complete) but I was referring to is there a way to determine how far along the requirements I am for a individual achievement?
No, I said the same thing as you. Look at the screenshot, I just found Rebellion also supports it. You can see it in your achievement list. Just look at from your Steam Community page or in game click view all achievements from Steam Overlay.http://i.imgur.com/a8Bx9.jpg
Here is the thing with the achievement, say you complete 10 missions in a game. It still won't show up because you have to complete 30 missions in the game (it has to be the same save game file, not across different games). Unless you are doing achievements that can cross game, some of the Team Fortress 2 achievements, I think there most definitely need new achievements that can be saved. Such as kill 30 titans, each time you kill a titan it would notch up. These notches not only carries throughout one game, but should carry through all games you play afterwards. So they probably will need achievements such as kill 100 titans, not that would be something.