Some champion skins not unlocked?

So I saw I had some champion skins challenges complete but the skins are still locked is there a fix for this?

Do whichever mission is required to complete the challenge and it will unlock. You don’t have to succeed at the mission provided that you’ve completed the challenge previously. For example, you can do The Algorithm on hardcore and jump off a cliff to get ISIC’s champion skin, provided that you’ve successfully completed the mission before.