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Masked Quartet
Complete all objectives in any Horrific Vision with any 4 Faceless Masks active.
Masked Quartet is a 5-point achievement earned by completing all objectives in any Horrific Vision with any 4 Faceless Masks active simultaneously.
Choose Your Four Masks
Select four masks from the available options before entering the Horrific Vision. Based on difficulty, the recommended combination from easiest to hardest is: 
Faceless Mask of Dark Imagination (spawns an aberration every 1-2 minutes when below 50% sanity), 
Faceless Mask of the Burned Bridge (void pools appear behind you as you move, draining sanity on contact), 
Faceless Mask of the Pained (applies 2 affixes per area instead of 1, difficulty varies by weekly affixes), and 
Faceless Mask of the Daredevil (sanity drain from enemy damage is multiplied by 5).
Avoid the Hardest Mask
Faceless Mask of the Long Night is considered the hardest mask available, so if you are attempting your first 4-mask run, substitute it out in favor of the four masks listed above.
Complete All Vision Objectives
With all 4 chosen masks active, complete every objective inside the Horrific Vision — the achievement is awarded upon fully clearing all required objectives in that run.