You do not need to actually do all the events of the series.
I ran "Novice series 1"
- had gold in the time attack with Abarth 500
- did not run the race with Abarth 500
- had gold in the time attack with Giulietta
- had silver in the race with the Giulietta.
- did not run the time attack BMW M3 E30
The goal for this series is to get at the minimum 3 bronze.
This is all you need to beat.
The achievement popped for me
when I got the silver medal on event number 4 (my third event).