Guild experience no longer earned via guild achievements
Community Manager Nethaera hit the official World of Warcraft forums this afternoon to announce a change to guild experience that has been implemented today. Until now, guilds received guild experience for achievements earned. Going forward, this will no longer be the case, and it appears the change is retroactive as well. Any experience previously gained via guild achievements is no more.
For guilds that are currently above the normally possible experience limit, we will be readjusting it back to the expected limit once more. This will not affect Guild Reputation gains at this point in time.