I like them when they're well-thought-out to the point that they enhance gameplay. Stick of Truth has one of the best achievement lists ever created in that regard. They push you to do things you otherwise wouldn't think of, and the results are hysterical. The only one that felt even the least bit grindy was one of them you get in Canada. I had a really good laugh at almost every achievement, so getting them all added an extra level of depth to the game. And besides, you
have to admit that the "Heisenberg" achievement was a stroke of genius.
Now, flip over to Dishonored. That game's achievements are about as shitty as can be if you try to get them all. One that I attempted to get on my first playthrough (just to get it over with) turned the game into such a tedious bore that now, months later, I still can't find the heart to pick it back up for another go. Of course, it doesn't help that the endings encourage you to play in that extremely boring manner - you can't treat Dishonored as an action game unless masochism is your one-way ticket to multiple orgasms. However, treating it as a pure action game is yet
another achievement, one that's diametrically opposed to the achievement I mentioned above, and requires another full playthrough that, from what I've heard, concludes with extreme disappointment. So, in my humble opinion, it's the most forcefully stealth-required game in the history of stealth games, and that absolutely ruined it for me despite the fact that I actually
like the occasional stealth game. Dishonored's achievements only compound the yawn/pain factor.
Don't even get me started on achievements based on collectibles. Some games do it right. Again, I bring up South Park: collecting every chinpokomon is a cinch, and if you don't find them all before the end of the game, going back to get the remaining ones isn't a painful task. You don't even need a guide to collect about 90% of them, or even 100% if you enjoy exploration. But the achievements for getting all of the collectibles in Assassins Creed? They can fuck right off.