Personally I hate it when you get one for finishing a chapter, but I love it when you get one of doing something weird, crazy or creative. That is why I really dislike the GFWL ones but I love the Steam ones, especially in Left 4 Dead. I think they did a great job with Team Fortress 2 as well, although forcing you to grind through them to unlock stuff was a bad idea.
In the end I dont really collect them and rarely check to see if I'm missing a bunch, but when I have an 'oh shit' moment and an achievement with a funny name pops up going 'yeah, that was pretty awesome' well it really makes me smile.
In the end I dont really collect them and rarely check to see if I'm missing a bunch, but when I have an 'oh shit' moment and an achievement with a funny name pops up going 'yeah, that was pretty awesome' well it really makes me smile.