A Mask for All Occasions is related to the seasonal world event Hallow's End. It was previously part of the criteria of but was removed in patch 3.0.3. If you destroy masks you have received, the criteria stay completed. Note that masks are BoP and cannot be traded.
Prior to the 2011 Hallow's End, this was one of the hardest holiday achievements to earn, as it required extreme luck, patience, and time. Players could only get a small chance at getting a mask every 60minutes by trick or treating with an innkeeper.
- Patch 4.2.0 (2011-06-28): Worgen and goblin masks added to the criteria.
- Patch 3.0.2 (2008-10-14): Added.