How effective are achievements on the service?

Question

Preparation of terms of reference

Good evening, when compiling the terms of reference, there was such an idea to create achievements for performing certain actions for which the user will receive n the number of achievements.
The service will be a sports service that will provide bodyweight workouts and training programs and nutrition, so far so.
Is it worth introducing achievements and what will be the profit from them?

Answer 1

Yes! But, there are moments:
1) They need to be beautifully designed, why the hell do I need ugly reach, moreover, the more difficult, the better. Should be super rare, like walking 100,000 steps in a day.
2) I do not need achievements that there is no one to show, do something like social. networks. Why do I need a beautiful picture, if I can not boast of it. See how many people on the toaster are shaking for achievements, even winding up with fake accounts. This area in online games is well studied, you can read about it.
If your project is serious and has a budget - yes, if it's a passing or low-budget project, so much so that you can't order a couple of dozen images from graphic artists - no.