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.
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.
Enter the Park.
Enter the House of Horrors.
Find your fate in the deepest ends of the Park.
Learn about Chad.
Leave the Park.
Find the pills.
Have a "conversation" with Chad.