Here is the full list of all 47 Project CARS 2 achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Completed a race around a single circuit in all 4 seasons
Completed a successful pit stop with manual control
Created a pit strategy and then used it when coming into the pits
Earned Affinity with two manufacturers
Downloaded another players setup from within Time Trial.
Finished 1st in an online race over 5 laps without making contact
Completed your first online race
Completed the first season
Unlocked your first Career Invitational Event
Became a Brand Advocate for a manufacturer
Earned your first Career Accolade
Won your first Championship.
Used 3 different custom car setups for a single car
Created a new driver in Career and signed your first contract
Taken a photo in photo mode
Earned your Rookie License
Earned all other achievements
Successfully completed a Rallycross season
Became an Indycar Champion
Completed 10 Career Invitational Events
Drove a clean lap around the Nordschleife in the snow, in less than 8 minutes
Completed an event in a Mercedes car at the Mercedes-Benz Driving Events Ice Track 2
Drove a clean lap around Fuji in Storm conditions, in a time less than 2 minutes
Did a Rallycross jump longer than 20 metres
Completed a Championship in every Motorsport discipline within Career
Won a full distance (200 Laps) Indy 500 race
Drove 4 Ferrari cars, around Imola
Raced for 4 laps in the Lamborghini Veneno around Red Bull Ring GP
Drove a Porsche 911 GT1-98 at 24 Hours of Le Mans Circuit for 24 minutes at 60x time progression.
Earned 50 Accolades
Earned your Amateur License
Earned your Pro-Am License
Earned your Pro License
Earned your Veteran License
Completed the Zero to Hero lifetime goal (start in Tier 6 and go on to win a Tier 1 Championship)
Won two different Tier 1 Motorsports
Won three Championships in three different Motorsport disciplines
Finished on the podium 50 times in a single drivers Career
Won the Indy 500, Le Mans 24 Hours and Azure Circuit Grand Prix
Earned four Lifetime Goals
Completed the Factory Drives set of events for a single manufacturer
Won all Factory Drive events for 3 manufacturers
Saved a car setup received from a friend
Joined an in-progress online race as a spectator
Used the Director mode for a full race
Used the Race Engineer in Tuning Setup and made changes based off their recommendation.
Earnt a B Online Reputation Safety Grade.