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