I don't have the technical skill or patience to get every achievement in those games that make you win online, and indeed, I no longer have the spare cash to go online with my Xbox 360, so those achievements greatly annoy me. Achievements earnable on my own, however, I absolutely love. I strive to get as many as I can, and for me, it's a great way to squeeze more worth out of a game once I've beaten it several times, found all the hidden weapons, used the weakest weapon to defeat the head bad guy, and whatever else. There always seems to be that one more achievement to try and nab, like Dead Rising's ridiculous "Zombie Genocide" achievement. On top of getting several extra hours of constant slaughtering, the end goal has a real prize - you get one of the best weapons in the game, certainly the best gun.