Dominate all sectors during the final lap in a round of a Domination event

You have to be the fastest in all the sectors in the domination event. The key word here is FINAL lap. In the left of your screen you can see each sector. When you dominate the sector it'll become yellow. If you dominated a sector but lost domination in a later lap, you will NOT get the trophy/achievement. If you dominate all sectors but you don't beat your own domination targets in every sector of your FINAL lap, you will NOT get the trophyachievement. The easiest way to obtain this is to make sure you don't dominate any of sectors going into the last lap, then in the last lap dominate all sectors.