Here is the full list of all 10 Gav-Gav Odyssey achievements.
Protect the dogs' waste
Release the dog named "Coal"
Release the dog named "Snowball"
Collide with a rocket on a spaceship
Complete the game on the difficulty of "Expert"
Face the masked monster
Collect 50 diodes in one run
Collect 20 diodes in one run
Collide with spikes
Collect 200 points on a spaceship