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.
Created a pit strategy and then used it when coming into the pits
Finished 1st in an online race over 5 laps without making contact
Unlocked your first Career Invitational Event
Completed a successful pit stop with manual control
Used 3 different custom car setups for a single car
Completed your first online race
Used the Race Engineer in Tuning Setup and made changes based off their recommendation.
Earned your Rookie License
Created a new driver in Career and signed your first contract
Earned all other achievements
Completed the first season
Successfully completed a Rallycross season
Became an Indycar Champion
Completed 10 Career Invitational Events
Earned your first Career Accolade
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 race around a single circuit in all 4 seasons
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.
Taken a photo in photo mode
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
Became a Brand Advocate for a manufacturer
Earned Affinity with two 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
Earnt a B Online Reputation Safety Grade.
Downloaded another players setup from within Time Trial.
Won your first Championship.