Does Google provide a global games achievements system like Game Center? or Xbox LIVE? Does Google Play offer an achievement tracking system similar to Apple Game Center, Xbox LIVE, and Steam? For keeping track of achievements, game progress, time spent in a game, what your friends are playing, etc.

Are there any other third-party alternative tracking system? with a huge base of supported games? I am thinking of something like Raptr for Desktop systems.
Just announced 24 July 2013 is Google Play Games.

The Play Games platform was first announced at Google I/O back in May, but until now, there wasn’t a dedicated app; you could see your achievements and online leaderboards inside your apps, but there was nothing that brought that all together.
The Play Games app changes that. It shows you all of your Play Games compatible titles, as well as those your friends are playing. And if you don’t yet have any Play Games friends, the built-in suggestion feature will help you find some.
Asphalt 8 Airborne, Riptide GP2, and Prince of Persia: The Shadow and the Flame are just a few of the titles that support Google Play Games, and you’ll find hundreds more in Google Play.

That's not to say that individual developers or partnerships might not aggregate their own games in their own &quot;game center&quot;. For instance Mobage, OpenFeint (recently killed), and the new Rovio Accounts.