From Shacknews: “The Luxurious Toast emote in Destiny 2 is unlocked in the Spire of Stars raid lair. Thankfully, you do not need to complete the entire raid, just the opening section in the Statue Garden. Upon completing the Statue Garden, a chest will appear at the rear of the room near the exit chute. The Luxur”
Source: N4G PC How to get Luxurious Toast Emote in Destiny 2