Dragonsphere1: Perhaps you mean the pop-up that you can see in the image that I attached? (embedded images using [img][/img] would really be a great addition BTW :) )
It pops whenever an achievement-unlocking action takes place, but to me it seems like it's a leftover from Steam rather than a planned feature - the achievement name is missing from the pop-up, only the achievement text is there, and what's that checkbox on the bottom - "show this question every time" - what question?? If you uncheck that, by the way, these pop-ups stop appearing. The funny thing is that there's no way to bring them back after unchecking this, unless you delete a registry key! I'd really not call such a thing a planned feature...
I think this new feature is connected to the Facebook integration (which is also new in version 2) - I think this pop-up serves to let you know that the game has posted something on your wall. If you uncheck the checkbox, it does the posting without letting you know. Only an assumption though.
So, in any case, there are no proper achievements in this game. Achievements of which you cannot keep track using an automatic list-menu are not achievements.
And what's the latest version number again? :) (I mean in-game, in the Options menu)