I'm aware that for some players the upgrading button overlaps with the Reroll button. I'm not experiencing this, so I'll have to do some more testing to see if I can replicate this, then I'll be looking into a solution.

Won with blacksmith yesterday, didn't complete the challenge.
I didn't do Endless or GMO.

https://i.imgur.com/B8iWu3x.png

Hey Irrational, thank you for letting me know, I'll look into it!

There was a slight mistake in the challenge ID. It's adjusted and uploaded, so the next win should unlock it for you. Sorry about that!