Project CARS 2

There are five different disciplines in the game: Open-wheelers, Prototypes, GT cars, Touring cars and Rallycross. You can view in which discipline you've won a championship in by going to Career>Progress & Settings>My Career.

The disciplines are divided in rows, with each one taking up one row, except from the GT championships that take up two. You need to win at least one championship (any one will do) in three different rows.

You can do this as you are going for your zero to hero achievement, or you can stay in the same tier and it should work since each motorsport is different. Just remember you have to win your championships for it to count.

Unlocked this last night.

I did the Karting Championship, Ginetta Juniors and Clio Cup. Upon completing the Clio Cup, it popped.