Defeat combatants, earn Infamy, and defeat Guardians in Gambit during Season 10.
Fireteam members contribute progress toward combatants and Guardians defeated. Wielding auras from Reaper and Invader sets grants the most efficient progress. Invader set bonus progress is awarded only on final blows.
"You'll be like a walking poster for Gambit. And practically a style icon. Heh." —The Drifter