First you need to qualify. Do this by entering qualification rounds for a tournament. Once your time is good enough you can submit your time and it will tell you your position (seeding) in the qualifications. Make sure to check your position regularly as you might need to re-qualify before the tournament starts.
Once you're qualified you can check in the 'brackets' section when your first round is scheduled (notice that this is your local time). At the specified time and date just enter the lobby and you'll get the achievement. You don't need to race or anything, just entering the lobby at the right time and date should unlock it for you!