WoW Achievements — Browse All Achievements
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Browse achievements from all expansions including The War Within, Midnight, Dragonflight, Shadowlands, and Classic. Find guides for Glory of the Raider, meta-achievements, PvP achievements, exploration, and more. Track your achievement points and completion progress via Battle.net.
Sinister Calling
Obtain a Sinister Squashling pet and Hallowed Helm through looting or Tricky Treats from the Hallow's end world events.
Sinister Calling requires you to obtain both a 
Sinister Squashling pet and a 
Hallowed Helm during the Hallow's End event, either by looting them or purchasing them with 
Tricky Treats.
Farm Treat Bags Daily
Visit an innkeeper every hour to receive a treat bag, which has a chance to contain either the Sinister Squashling or the Hallowed Helm. The Sinister Squashling must be learned and added to your pet spellbook to count toward the achievement.
Kill the Horseman Daily
Defeat the Headless Horseman each day for additional chances at both items; killing him multiple times per day across different characters increases the number of bags you receive.
Buy Hallowed Helm with Treats
If you have 150 Tricky Treats but no Hallowed Helm, purchase one from Chub or Dorothy to trigger the achievement condition; you can then sell it back to recover your 150 Tricky Treats while keeping the achievement credit.
Tips
The Hallowed Helm must be looted by your character directly, or purchased from Chub or Dorothy, to fulfill the achievement condition — having it in your collection from a previous year does not count unless the loot or purchase condition is met on that character.
If another player wins the Hallowed Helm roll and trades it to you, you will still receive achievement credit after leaving the dungeon.