Guild Wars 2

The Spring Update modified all Specialization Collections to only require Bronze or better for the item credit. Yet the Hivemaster Basic collection item titles for adventures indicates that Silver is still required; however, the description of each of the adventure items within the Hivemaster collection include the words: “Hint: earn bronze or better in this adventure.” This description was changed from “… earn silver or better …” to “… earn bronze or better …” for Hivemaster as part of the Spring Update.

So, the bug is either that the titles/performance credit should be changed to Bronze (to match the Specialization collections) or the description inside needs to be changed back to: “Hint: earn silver or better in this adventure.”

You need silver, just did the last adventure (pact rifle) and did not unlock at bronze but did at silver.