This guide shows you How to unlock the secret “Odynom-Nom-Nom” Triumph in Destiny 2.
Get the bounty “Dark Monastery” from Petra Venji in the Dreaming City. Remeber, this Bounty (quest) is only available every 3 weeks!
Play the mission until this point in the video which is close to the end. Under the bridge is an 585 LL enemy and if you kill this enemy the triumph unlocks.