Version 2.4 Story Quest Locked Achievement - Ain't Nothing to Fear | Honkai: Star Rail

Ain't Nothing to Fear is a version 2.4 achievement that is currently obtainable only during the main story quest, "Finest Duel Under the Pristine Blue (I)," as the enemy Howling Casket appears only in this quest. Completing the related achievements during the story quest is highly recommended since Howling Casket is not found in world exploration.
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[@autumnakiyama3012]

Ty for explaining this in more detail