Start a game in Retro mode, pause the game, go to "Options", turn on the 8-bit filter. Finish the game.
You can get this trophy along with "Still got it" in one game if you have not already earned it. Follow the above instructions and when selecting teams, choose to play against a Double-A team, select your team to be an All-Star team, set hitting and pitching difficulty to beginner. Win the game!