You get the new achievement by completing the “Training Day”.
How to Complete Training Day?
If you’re an old player, you should go to Play > Practice and in the left side’s cheat menu, at the bottom’s a button that’ll allow you to replay it.
Once you beat a round against very easy bots, you’ll get it.
If you’re a new player, I guess you’ll get a pop up or get booted into this tutorial.