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