History of Bright Side of a Bad Idea

The triumph has no description or objectives in game data, so its requirement is unconfirmed. The name matches a lore entry in the book "A Drifter's Gambit" (added with Forsaken, 29 Aug 2018), which describes the Drifter holding a caged army of Taken, so this is likely a lore-related triumph. No source I opened confirms how it is earned or what it rewards.