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Can be done during Hallow's End (October 18 - November 1)
During this event and if you want to get this achievement you must visit listed taverns in the Azeroth. Eat a lot of sweets, fight in pvp battles, burn scarecrows and fight the main boss who embodies the holiday - Headless Horseman.
It's time for spooky stories, masquerade and pumpkin pie! Are you ready to visit almost every tavern in Azeroth and sample some nasty sweets? No? Hmm, well, our best boosters will fly on the wings of the night throughout Azeroth, infiltrate the capital of the hostile faction, cut off the head of the Headless Horseman (whatever) and deliver it to you. Come on, hurry up with pumpkins - Hallow's End is a limited time event.
You can buy Hallowed Be Thy Name achievement with ReinwinBoost team cheap, fast & safe.