This is for winning your first game. To do this you have to be the last person standing. If you are playing in duo or quad, only one person from your team must be left standing for the rest of the team to be awarded the victory.
Edit: The patch on 1/31/19 appears to have made it so that wins are no longer tracked and thus this achievement is not currently unlockable.
Edit: The patch on 2/12/19 seems to have restored tracking for this achievement.