Achilles: Legends Untold

Cursed Masks will be introduced as part of the story shortly into the Greece Coastline map. You will be put in an arena against a large number of enemies, then asked to destroy four masks to dispel a curse so the blacksmith can set up shop. Use  to aim your shield and throw it to destroy them. From there, you'll need to progress the story a bit further and once you return from the labyrinth the rest of the mask collectibles will have spawned in the map for you to destroy. I made a separate guide page with their locations HERE.