This tool can support any game that has achievements on Steam, even if it is not listed directly in the dropdown box. Simply type its ID into the editable dropdown box text and refresh.
What's new? See the blog.
That's right. Steam now has the capability to secure achievements from being managed. Naturally this means you can't unlock them. Good for them. :)
Use the tool again? (Valve hasn't reset achievements since the original medic pack release)
OH NOES (I don't care).
It's a sample game to demonstrate SteamWorks API to developers.
That wasn't a question.
You're probably talking about Portal, Half-Life 2: Episode Two, and Team Fortress 2. These games had achievements before the system for achievements was really nailed down in a standard way, so some achievements do not get translated text from Steam, they get the IDs instead. This is a bug in Steam that simply hasn't been fixed because it's such a low issue that doesn't occur normally.
You don't own the game or the game does not have achievements. If you or it really does, restart Steam and see if the issue clears up.
Contact me through either SA or FP so I can work the issue out with you.