I used to be an achievement whore, but that was when I couldn't afford to buy games on a regular basis and getting all the achievements was an effective way to increase a game's lifespan for me (I was also the type to complete everything in an RPG, I remember going out of my way to open every single chest in Dragon Quest VIII). Once I was able to buy a game after beating my current one to my satisfaction then I stopped caring as much. I still try and do some hard ones for a fun challenge and to try to compete with my friends (which became impossible once I got a PS3 and stopped buying as many games for my XBox 360)
Though I don't think I try that hard to get achievements anymore, I still feel a great deal of satisfaction when I do get one and that little notification pops up. The nicest ones are the ones you get for beating a game on its hardest difficulty mainly to show as proof to people who don't believe you did it (which is why I'm upset that there are no trophies for MGS4 and I have to show my friends the save file that I got the Big Boss medal in to prove it).
Though I don't think I try that hard to get achievements anymore, I still feel a great deal of satisfaction when I do get one and that little notification pops up. The nicest ones are the ones you get for beating a game on its hardest difficulty mainly to show as proof to people who don't believe you did it (which is why I'm upset that there are no trophies for MGS4 and I have to show my friends the save file that I got the Big Boss medal in to prove it).