Create a Grand Prix with the Full Qualifying length. The number of race laps can be as low as 3, but remember, you are going to be starting from the end, so you need to have enough laps based on your skill to be able to get into at least 3rd position. This is also easier if set to the lowest difficulty.
In Qualifying, you can't just retire from it. I put in a very slow lap, qualifying last (got 5 grid place penalty too for blocking another car) and fast-forwarding time to be knocked out in Q1 (meaning you were in the bottom 5 of drivers). You may be able to just fast-forward time and not even put in a time and this may also count.
Then, you need to do the race and get onto the podium, which means completing the race in at least 3rd position. Then after the race concludes and results are shown, the achievement will process.