That doesn't do him any good getting his missing achievements. The only way to get those is for him to log onto a console with Root Beer Tapper's license tied to it so he can log on with his account and access the game.
With it delisted, he can't purchase it himself. And unlike a few games like Joust, I don't believe that Root Beer Tapper was ever available via redemption code (Which if never exchanged, are still valid for delisted games like Joust today).
Last edited by Atariboy; 03-04-2013 at 10:33 PM.