I think there's always some achievements that are worth looking into. They can allow you to look at/play your game in a way that may not have been obvious to you the first time around. For instance, in Red Dead Redemption, the achievement where you tie a woman up and put her on the train tracks. Or Portal 2's Smash TV achievement making you think about how you to use your portals for something other than getting to the exit.
The achievements that you get for completing chapters/parts of the game/etc. seem to be there just to allow other people to know how far along you are in the game. Luckily you don't have to grind for those. The ones you have to grind for are generally pretty worthless unless, like tenchi said, it unlocks something in the game.
And...those are what achievements are for.
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