Here is the full list of all 14 The Park achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Have a "conversation" with Chad.
Leave the Park.
Find your fate in the deepest ends of the Park.
Enter the House of Horrors.
Learn about shock therapy.
"Me and Callum."
Find the pills.
Learn about Chad.
Obtain a flashlight.
Take a rollercoaster ride.
Find the missing Ferris wheel cart.
Take a ride on the bumper cars.
Take a ride through the Tunnel of Tales.
Enter the Park.