A good set of achievements for me definitely adds to the enjoyment of a game, and likewise when they're crap they tend to put me off. I know most games will have a few good ones and a few duffers, but what I'm interested in for this thread is on the whole, which games that you have played do you think have the best set of achievements, and which have the worst? Reasons why would be good as well. My opinion... Best: Crackdown Dead Rising Bioshock Dead Space Bully Fallout 3 the Call of Duty series (except 3, with the stupid MP achievements and even stupider SP) Assassin's Creed (with the exception of the flag collection) Halo 3 The Orange Box (not only were they interesting, the tracking system was great - this was copied by Gears 2 but should be mandatory for all games IMO). Almost all of the games I've listed as having the best achievements are because for me, they were either loads of fun to get, or else because the difficulty of the achievements was pitched perfectly and allowed me to obtain them with just the right amount of effort. Honourable mentions would be Mass Effect and Just Cause, but the achievements in these games just take too long to get in comparison to the level of satisfaction you get from playing the game. Worst: Gears of War (because of stupid MP achievements like killing a billion people - SP achievements were pretty good); GTA IV (see Gears of War) Hitman: Blood Money (because the achievements didn't stack - devs who don't stack achievements should be roasted slowly on a spit) most Arcade games (because they seem to make at least half the achievements next to impossible in them. Zuma, Marble Blast Ultra, Hexic, Small Arms, I'm looking at you in particular.) King Kong (too easy, no sense of achievement) Fight Night Round 3 (see King Kong) In case you haven't picked up on it, I hate multiplayer achievements and think they ruin online games. Might be partly why I prefer COD over other online games.