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World name: Omega
Character name: Lulu Lululo
NPC name: Recompense Officer/Calamity Salvager

Steps:
1. Complete 2013 "All saints wake" event's 1st quest "Not-so-evil Dead"
2. Got "The Wailing Spirit" costume as the reward
3. Did not completed the event, so no achivement
4. Discarded "The Wailing Spirit"
5. Both Calamity Salvager and Recompense Officer do not have this costume.
Even so Calamity Salvager sells quest rewards, apparently Recompense Officer's shop is based on ahcivements.
6. So in the end I'm stock in between "I have complited the quest" and "I cant buy the reward for this quest"