(BLIZZARD UPDATE) Guilds Who Didn’t Get Hall of Fame Must Kill One-Armed Bandit and Mug’zee Again

Blizzard has announced that guilds who did not get Hall of Fame must kill One-Armed Bandit and Mug’zee again to get the achievement.

Edit: Blizzard has updated saying that they believe that you need to kill One-Armed Bandit and Mug’zee again.

This seems to confirm that you if you are currently extending you will not receive Hall of Fame until after you kill the bosses again.