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.
Find the pills.
Learn about Chad.
Find your fate in the deepest ends of the Park.
Enter the House of Horrors.
Obtain a flashlight.
Take a rollercoaster ride.
Find the missing Ferris wheel cart.
Take a ride on the bumper cars.
Learn about shock therapy.
"Me and Callum."
Take a ride through the Tunnel of Tales.
Have a "conversation" with Chad.
Enter the Park.
Leave the Park.