This is a simple, yet boring achievement that requires you to play 0 games if you want to, you can simply sim through the seasons and get promoted to the first line like I did.
I started up a Be a Pro starting in the NHL for the Philadelphia Flyers, which should be no sure judging from my gamer pic
. I just simulated through every game, and as my player kept on growing in terms of his overall skill he got promoted up in lines. Do not be worried you will get sent up and down non-stop, even sent to the AHL, but eventually when you get good enough you will get put up to the first line and pop this achievement.
This took quite a few seasons to sim, and I got up to an 80 overall when I was promoted to the first line and popped the achievement.
If you really want to you can play and do well in some games, but in my opinion will just be a waste of time as eventually you will get this achievement from simulating, but if you want to play by all means go for it, either way this will come naturally.