This pretty much epitomizes what's wrong with achievements/trophies (achieverophies?) today. Either they're practically given away for doing such things as turning on the game, or they force you to spend far more time than one would usually give to a single game to obtain. This, however, is not the fault of the trophies, but rather of the devs who seem to have lost sight of what an actual achievement should be.

On the whole, I'm of the belief that trophies should be things that take some extra effort to obtain, but not to a ridiculous extreme. Beat a single player game? Sure, that's worth a trophy, I think. You played through the whole experience of the game, saw most or all of what the developers had to offer, and had enough skill to overcome it. It might not be particularly monumental, but I think it just edges over the line into an accomplishment, though perhaps that's dependent on the game itself. Beyond that, perhaps there can be ones for maxing out particular skills during a single playthrough, or managing to flawlessly pass a particularly challenging bit. Those are also rather dependent on the game, but still pretty reasonable, I think. Now, forcing you to grind out a certain skill that's otherwise worthless outside very specific points? Not okay. Nor would be making incredibly difficult to find areas in linear games, or forcing you to play through a sandbox game while limiting yourself between the tools you're given.

Now, for a multiplayer game? That's a whole other story. Shooters tend to vary on how exactly they give these out, though most usually give a starter one for winning a match, with more trophyments given out as your W/L ratio climbs. Halo has them in the form of unusual kills or managing to satisfy the conditions surrounding scenarios that are generally hard to actually obtain in normal multiplayer play, which strikes me as a bit of a kick in the face if your playstyle isn't suited for them. While it's a bit plain, I tend to prefer the former, as it encourages a more competitive mindset in those who are trophychievment hunters, and come as nice surprises to those of us who aren't.

Now, Dust is a bit of a special case. While I enjoy the gameplay to a degree, I feel as though trophies might...cheapen the experience, I suppose? While the game is certainly open to casual players, it really feels like Dust is there to cater to a more hardcore audience, and that such a thing as trophies might be a tad pointless in the overall scheme of things.