History of Costumed Completionist

Costumed Completionist is a Festival of the Lost triumph: "Collect all the mask upgrades." The in-game objective is three upgrades.

How to complete

• Each mask upgrade costs 1,500 Candy, so three upgrades is 4,500 Candy in total (The Nerd Stash).
• Open the Event hub and view the Haunted Mask tab to see each upgrade's requirement. Examples from the 2025 event: the Fungal Mask needs void crystals shattered and combatants defeated in Haunted Altars of Sorrow, the Orin Mask needs Headless Ones defeated and Altar waves completed, the Lodi Mask needs candy collected and event activities completed.
• Event mask names, counts and costs changed between years (the 2025 event lists six masks), so the three-upgrade version may be from an earlier year. Which year this triumph belongs to is unconfirmed.

Destinypedia notes 2025 was the last Destiny 2 iteration of the event.