Largest player-base not to complete an Xbox videogame

Largest player-base not to complete an Xbox videogame
Who
Prominence Poker
What
31,732 people
Where
Not Applicable
When
13 July 2017

Of the 31,732 Prominence Poker Xbox One players tracked by the Xbox site TrueAchievements, as of 13 July 2017, not a single one had completed every challenge in the game. The elusive achievement was "Billionaire", which requires players to reach 1 billion bankroll. Prominence Poker is a free-to-play poker game published by 505 Games in 2016.