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