EDIT: Apparently the description for this achievement is incorrect. You will need 3 of each in a single theme according to the developer.
Thanks to Anthonymm
for sharing this info.
Big Win = 500+ coins
Mega Win = 5,000+ coins
Extra Win = 50,000+ coinsOriginal Post:
More of a notice than a solution.
Just had my 3rd Big Win in the Classic theme and this didn't pop. Seeing how as of this time 8 gamers have had 10+ Big Wins overall, I'm gonna go ahead and say either this is glitched or the description is wrong. I'll be inquiring to Game Troopers about what is going on.