Hey Gamers! Welcome to NHL THREE's in NHL 19!
Video below shows how to easily unlock this achievement!
Basically, you can play a game on semi-pro or rookie difficulty to get at least 3 goals and a shutout and you will get 3 stars on these games! Also, keep the money puck on and you can likely get 2 or even 3 goals for a single goal and potentially end the game even faster. Very easy to do.