The main page you've linked to tells me almost nothing about the service you're offering. From the first page I should be able to answer the following question

The main page you've linked to tells me almost nothing about the service you're offering. From the first page I should be able to answer the following questions: - What's an achievement? What's a badge? - How do I earn them? If I want to go off and earn something right now how do I do that? - Why do I care? What's in it for me? It's difficult to review something when I have no idea what it is. (Edit: formatting)