No Achievement Pop-up/notification

I’ve installed the plugin and set up a couple of achievements. I can see that some folks have unlocked the achievement but no one is getting the notification. I’m not seeing a popup, redirect, email, nothing. I’m not sure how to resolve this. Any help would be appreciated. The site is thisweekinblackness.com and at the moment i have leaving 1 comment will unlock an achievement.

http://wordpress.org/extend/plugins/achievements/