ornate fractal
The achievement was not awarded after winning a run on Black Stake difficulty, but was awarded a few runs later, after winning on Blue Stake difficulty.
It says "Win a run on at least Black Stake difficulty", so it's either worded wrong, it's supposed to be for blue stake, or just something else?
this was the winning run on black stake (in which i got speedrunner as well, so maybe a conflict of achievements?)
and this was the blue stake that triggered it
tardy bluff
I had the same issue today. Won black stake on the magic deck and it didn't trigger steam achievement. Played several runs on other decks after.
Haven't done black on any other decks yet, so don't know if its specific to that one
supple ice
can +1 that this achievement doesn't pop for black stake, it pops for blue stake
solar helm
This also happened to me, I just completed black stake and wondered why i dint get the achievement
cinder stone
its cuz black stake used to be stake 5 and blue and black stake swapped positions
tardy bluff
Yeah it popped after blue stake for me as well