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