I don't agree with the achievements are "Useless" and I believe you are being sarcastic. But these achievements can be difficult and tasking to achieve. I think it's great Apple developed the idea for the Milestones achieved. It creates a gateway what someone had to overcome to the physical tasks to acquire the achievements. And it motivates the indvidual to keep pushing yourself.
Now tell me did you get ALL of them? I bet you didn't