Here is the full list of all 10 Get Together: A Coop Adventure achievements.
You embarked on your journey and well.. got lost..
You communicated well enough to find the way to an elevator.
Teleport out of the cave.
You freed the magical companion from its cage.
Once we reach our lowest point, we are open to the greatest change.
You jumped against some stones... and they fell down!
Follow the companion through the gate.
Solve all the puzzles and find you way to reunion.
Don't forget to bring your friend...
End the game with each character.