No Kilidescope skin...

[jothix]

All weapons,grenades and melee weapons diamond but kaleidoscope skin doesn't unlock? Anyone else have this bug?

[Dopey Shepard]

if you encounter this kind of thing #1 suggestion is to get a win, any mode, any difficulty, just get a win (claim the crown) and see if it resets. Should help

[Noisestorm]

You should get it after finishing one island on a new run. If not double check that there isn't a sneaky Sapphire medal one one of the weapons / abilities.