Achievements/Trophies/Medals or what have you. Are there games you normally wouldn't play that you do because of their inclusion? Does it increase how much time you'll put into a game? I have to say i've played a lot of games that use achievements in lame ways and its really put me off from them. I go far more into the subject on my blog: http://berathen.com/2013/11/do-you-play-for-achievements.html
Is there a game you like that uses achievements well?
N1nj4X
I play games because games are awesome. But sometimes, I like to play to get some challenging achievements like "kill 10000 enemies" or "get 1000000 points". Is pretty cool.
Venks
One achievement I enjoy is getting to wins in a row on online ranking matches in Street Fighter. That's something I feel like I can brag about.