Well since last time, I now have two more at 100%. First I finished Tomb Raider. Most of it was quite fun apart from grinding two MP achievements. I also got 100% in Plants vs Zombies. After starting it in January 2012, I hadn't played much more till recently. The last achievements were a mix of grind, and needing to get certain techniques and skill! oh and a big amount of luck.
I've also finished (but not 100%ed two GFWL games, Kane & Lynch Dead Men (shit game) and Bulletstorm which was a great game. I'm not sure which I want to focus on for the next 100% .. maybe finish Torchlight .. just one left, but many hours to sort that out.
In the mean time, I've started Bioshock and starting to get a feel for it. If I finish that, I'll do Bioshock 2 and get the achievements there.