yes i try to get all the achievements,

Trophies have motivated me to do this and that makes me very happy. I would have missed a ton of awesome content if it weren't for trophies guiding me to look for them.

I always try to do it, but eventually it becomes boring and not fun, so I quit. After all, if its not fun... Why do it?

I'm an achievement whore but I've only actually managed to 100% a few games ( 5 retail, 4 arcade on the 360), if I had more time I'd 100% a lot more but I don't so I'd rather play other games

I try to in the games I really enjoy. Maybe not 100% but I like to complete at least 75%-80% trophies of most games I play.

Only in certain games I really like. Such as Ocarina of Time, Castlevania SotN, Dragon Quest VIII, Muramasa, etc. Now since I'm a gamer, that turns into quite a lot of games. Currently by my count, I have 'completed' about 65 games. But still, compared to how many games I have played over the years, that's hardly a dent.