Here is the full list of all 14 Hyperun achievements.
Make 500,000 points in a run
Beat 400 km/h
Make 50,000 points in a run
Make 100,000 points in a run
Beat 300 km/h
Beat 200 km/h
Make 5,000 points in a run
Make 10,000 points in a run
Beat 500 km/h
Beat 600 km/h
Beat 700 km/h
Beat 800 km/h
Make 1,000,000 points in a run
Make 10,000,000 points in a run