Sounds good to me. I don't mind achievements - some times I even like them, especially if they unlock stuff in the game - but many times they are just shoehorned in for the sake of being there. Unless your game is really bad and people playing it really deserves a medal for each stage cleared then what's the point of getting an achievement for doing nothing but progressing through the game?
So I'm definitely in favour of this decision. Developers are free to include any amount of achievements but aren't forced to do it. I'll still be able to show off my unlocked achievements through Miiverse. That's enough for me personally, though I understand why people who like having the total of all achievements from all games available are furious.