Here is the full list of all 33 Park Beyond achievements.
Have 5,000 Visitors in your park at the same time
Build and open 30 flat rides in a single park without buying any land extension
Hire 2,000 staff members
Build a modular ride with at least 5 Cannon modules
Build and open 5 modular rides in a single park
Complete Mission 8: 'Top of the World'
Make 500 Impossifications
Complete Mission 7: 'A Tale of Two Theme Parks'
Fire a staff member that is low on energy
Hire 500 staff members
Have 100,000 visitors
Spend 20 years in game
Complete Mission 6: 'Taken at the Flood'
Make 100 Impossifications
Build and open a Rollercoaster with 10 or more Spring Modules
Complete Mission 5: 'Duel at the Beaches'
Earn $1,000,000
Build 1,000 structures
Spend 5 years in game
Purchase every land extension in a single park
Earn $200,000
Complete Mission 4: 'An Eye for Details'
Have 10,000 visitors
Hire 50 staff members
Complete Mission 3: 'The Dawn of Impossification'
Build 200 structures
Make 10 Impossifications
Earn $50,000
Spend 1 year in game
Complete Mission 2: 'Welcome to Cloudstormer'
Build 50 structures
Complete Mission 1: 'Ambitious Beginnings'
Have 2,000 visitors