What's the point of game achievements?

No, it's just there for some fun goals to try and accomplish.

No, no rewards or anything like that. It's just an overall sense of accomplishment, and another carrot to run after while enjoying the game.

It's actually quite fun to try to accomplish these things once you master the game's mechanics.

"Win the game with only your pinky while singing Disney's 'It's a small world after all' theme song all the way!" - Excellent achievement