It's there! In my Developer Console... "Google Play Games Services"!
I can't wait to play around with it, and network up my Tic Tac Toe game, and hopefully finish up Euchre soon, and get that networked.
I have some achievement ideas for Tic Tac Toe as well. I know, there's not a whole lot you can do with achievements in Tic Tac Toe, but I found some things. I've also got achievements already built into the existing Windows version of my Euchre game, so those will be coming over to Android, and I may add a few more. I may also categorize them a little differently than they are right now... we'll have to see.
In any case, I'm REALLY excited to get coding, there's just one problem... I don't have much time this week because I'm moving this week/weekend :-(
So most of the work won't even get started until next week. I've first got to read through the documentation and see how to use the API and all of that stuff, so it might be a couple weeks before any actual progress gets made. We'll see how difficult it is, hopefully I can get some good work knocked out in a little time.