Hi Icestar4495! This was resolved in a previous title update for Valhalla. If you're still experiencing this, can you confirm the version number of the game you have installed.
I got the latest update 1.3.0 and still haven't completed it, even tried removing and switching tattoos but still will not unlock
So we can look deeper into this, can you reach out to us via private message on either Twitter or Facebook @Icestar4495