Here is the full list of all 10 Psebay achievements.
Complete all levels of the chapter “Road of Psebay”
Drive more than 50m. in the infinite level
Create more than 3 levels using level editor
Tear off the front wheel more than 4 times
Stay underwater for more than 20 seconds (in total)
Fall off the motorcycle more than 50 times
Drive more than 250m. in the infinite level
Get 3 stars at all levels of the chapter “Road of Psebay”
Drive more than 500m. in the infinite level
Drive more than 1000m. in the infinite level