History of Challenger Approaching

Challenger Approaching is a triumph whose game text reads: defeat the opposing leader, or defeat opponents as a leader, with an objective of 6 opponents defeated.

How to complete

No source I could open describes this triumph, so the activity, seal and any reward are unconfirmed. The wording suggests a competitive mode such as Crucible or Gambit where one player is marked as the leader; defeat six opponents while being the leader, or defeat the leading opponent. Treat this as an inference from the game text only.