There are so many achievements, it's daunting to try to sift through them and identify those that are relevant to your current skill set. (I don't think I've really looked at that listing till today.)
There IS something fun about just being surprised by an achievement when you weren't trying to do anything in particular, so maybe nothing should be changed here. And I get that these are different from the rock quests... I think of those as being in part to show you a particular feature of the game. (Although you do usually get a new quest as soon as you get a new skill, so they're a little related.)
But I'm wondering even about an ability to sort the achievements by the related skills... these are plant-related things, these are animal-related things, these are element-related things, etc.
And more strongly, I wonder about a mini-me rock that would have not-quite-quests, but highlight achievements that one is close(st) to completing. This could potentially help, too, when one doesn't have any quests and feels like they don't know what to work on next.