Leveled 3 gems to 55. One on my crusader and two on my demon hunter. Seasonal journey is not recognizing it. Tried putting the two from my demon hunter into the stash and picking it up with crusader and it still did not register. Gems are Bane of the Powerful, Simplicity’s Strength and Boyarsky’s Chip.
After that, level up any gem will grant you the achievement.
Well that’s weird, because it counted the gem on my crusader for the 35 and 45 achievements. Edit: Brain fart, totally forgot about the Bane of the Hoarder(50).