Adventure tab is unavailable in the Advancements menu. Unsure if there is a trigger for when it appears, but base on a review of the snapshot by Xisumavoid, it doesn't appear so. This occurred in a game created in snapshot 17w14a.
Environment
OS Windows 10 64-bit, I7-5820K, 16GB RAM, GTX 970, Java 1.8.0_121
Linked issues
duplicates 1
Attachments
Comments 2
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-115424.
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Try killing a mob.