Frames on the maps

How game shows your map accomplishment on different difficulties? I mean, like 4 skulls in the first game.
Im playing on champ difficulty, finished all of them, but still frames are in steel colour. Where i should look for those ‘skulls’? If there is any.

The frame for finished level on champ is in the “steel colour”.

Why not join the Fatshark Discord https://discord.gg/K6gyMpu