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A Mask for All Occasions
Collect the 24 unique Masks listed below.
A Mask for All Occasions requires you to collect all 24 unique masks available as prizes from Trick or Treating during the Hallow's End event.
Participate in Hallow's End
All 24 masks are awarded as prizes through Trick or Treating during the Hallow's End seasonal event. You must collect all 24 unique masks to complete the achievement.
Account for All 24 Masks
As of patch 4.2, the required mask count increased from 20 to 24, as Male and Female Goblin and 
Worgen Female Mask masks were added — ensure you are tracking all 24 masks, including the newer Goblin and Worgen variants.
Destroy Duplicates Freely
Once a mask has been obtained, it is permanently counted toward the achievement, so you can safely destroy duplicates without losing credit. Duplicate masks can and do drop from Trick or Treating, so receiving the same mask more than once is possible.
Tips
This achievement is no longer part of the Hallowed Be Thy Name meta-achievement, so it will not block that meta if uncompleted.