It's not clear what achievements you need to get this one... And if you need retired ones, it should be retired also?

I was going to say you might need all the achievements listed on the Subeta Wiki page, but I'm not entirely sure because I have the Vesnali Champion achievement, but not the maxed out Flower Finder one?

But that might be a place to start? =)

I just completed all the achievement listed on that wikia page and haven't gotten the Vesnali Champion achievement yet. I came looking to see if there were other requirements too.