Here is the full list of all 10 Return to the Skyway achievements.
Pick up Chad.
Pick up Soos.
Outrun Bruno.
Pickup the first missing ship part.
Pickup the second missing ship part.
Pickup the final missing ship part.
Throw an animal 10 times.
Throw an animal 50 times.
Throw an animal 100 times.
Complete the first level.