i did the quest for legend of acrius back during leviathan but when i went to reclaim it from the collections it says i do not have it and need to get it from the kiosk even though the kill tracker says i have had it and used it in the past.
Kill tracker may be picking up the kills while doing the quest. If it's not able to be pulled from collections you likely never fully completed the quest.
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Unfortunately, if it not unlocked in the kiosk, you will need to purchase it. The kill tracker is probably showing kills from the quest version that had several steps including a raid completion as a requirement