Here is the full list of all 15 HangOutGame achievements.
Complete "Snow wall"
Complete "Out of mine"
Complete "Escape"
Complete "Desert treasure"
Complete "Cant sleep"
Complete 5 worlds
Play online with somebody
Stun an enemy
Survive with 3% HP
Complete any world without deaths
Complete any world without receiving damage
Cause an earthquake
Stun other player
Hook 30 times without falling
Get to the finish first