Comment Err... (Score 1) 176
High school diploma, BA/MA/PHD technical certifications, wedding ring, etc. are all pretty much achievements.
Life is full of times when you get stupid pieces of paper or random objects that show that you've done something. Might be something useful/positive (PHD), negative (prison record), or only really of interest to you (photo of the person who had a summer fling with), but it's all the same thing. Video game achievements are just an attempt to replicate the "see, i did that!" aspect of real life - albeit in a way that stimulates people's competitiveness.