Idea: A game that offers real certifications?

After watching a TED talk by Jane McGonigal: Gaming can make a better world today, I immediately came up with an idea; what if while questing in a game you were notified of an achievement being unlocked, which instead of a virtual gift or prize, was a real life certification? For example, if the game involved radios, they could slowly quest up your knowledge of radios, enough to the point where you could pass the amateur (ham) radio exam in your country. The same could be said for at least the written portion of most certifications, including a boat or pilot's licence, a new language certificate, a firearm licence, computer related certifications, the options seem endless.