Sort steam by unearned Achievements? [duplicate]

I play several games on Steam and I love the achievement system. It would be great to get an overview of all the achievements ever gained in Steam games. Does Steam support this? I haven't found such an overview.

If such a feature does not exist, I would already be happy with an easy way to calculate the sum of all my achievements automatically.

Edit: I stumbled upon an interesting website called TrueAchievements today. Unfortunately it only works for XBox-Achievements. Does anyone know of a similar service for Steam? This would solve my question right away. Implementing my own solution based on the links posted in the answers didn't work because the APIs are not sufficient for my needs.

There is also playfire.com. It tracks all of my X360 achievements, and there is the capability to track Steam, as well as PSN and XFire. I do not have a steam account, but I like what they do with the XBox. Might be worth trying out for Steam.

I don't think that Steam provides such an overview. However, Steam (and Steamworks) provide tools that could easily give the possibility to build it.

Check out the documentation and examples:

• https://partner.steamgames.com/documentation/api
• http://steamcommunity.com/dev
• https://developer.valvesoftware.com/wiki/Steam_Web_API

Some community platforms provide almost that kind of feature (but not exactly what you want, I think). You should have a look at Astats (especially this page) and Steamlevel.

Steamlevel also says something interesting about Steam web API and achievements (in its FAQ):

Can you show achievements?

I'd love to! Unfortunately Steam's Web API for achievements isn't public for all games. I could list achievements of Valve games, but achievements aren't readily available. I'm still working on researching other ways to retrieve them, but don't hold your breath.

For the records, most of those links came from this Steam's forum discussion: Is there any site that will allow you to compare Steam collections?