History of Crucible Contract

Crucible Contract is a 25-point triumph: defeat Guardians in Crucible with any Seasonal Quest weapon: Adored, Salvager's Salvo, Null Composure or Ascendancy.

How to complete

1. Own at least one of the four weapons (the Ascendancy rocket launcher was the Season of the Lost ritual weapon, earned at rank 16 with a vendor such as Lord Shaxx; later buyable at the Monument to Lost Lights).
2. Equip it and play Crucible; kills with any of the four count toward the one objective.

Unconfirmed

The required kill count (a search snippet suggested 50, which I could not verify on an opened page), the acquisition of the other three weapons, and the seal were not confirmed from opened sources.