Out of the gate achievement

Hi all,

I tried a private league a streamer hosted and the achievement didn't pop. Does anyone know how else I can unlock this?

Thanks

It only applies to events hosted by GGG.
Since it has been a while since the last real race event your best chance is the events at the end of a league like the "Krangled Passives" or "Endless Delve".

The last time, as far as I remember, was at the end of Trial of the Ancestors