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.
Enter the House of Horrors.
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.
Learn about shock therapy.
"Me and Callum."
Take a ride through the Tunnel of Tales.
Have a "conversation" with Chad.
Enter the Park.
Find your fate in the deepest ends of the Park.
Leave the Park.