After any race you do, you are given the option to save your reply. Just do this once. Call it whatever you like then forget about it. After the race, go to the main menu and select Gotham TV. You should be able to watch recent matches’ people have played. Once you start watching one, abandon the event and repeat a further 9 times. After you have done this, press your Xbox guide button and press for the dashboard. When you get back to the dashboard, loads PGR3 back up again. The achievement should unlock then.