Here is the full list of all 27 Planetoid Pioneers Online achievements.
Drop a custom scene PNG into your game to add it
Keep an exploding gun in your hands while it detonates
Grab a bird
Remove a sticky grenade from yourself
Throw an exploding drone
Add a component to your own body
Add 4 thruster components to a vehicle
Construct something out of 6 components or more
Construct an invisible trap
Add a wearable to your own body
Add a bomb to your own body
Complete the tutorial
Complete all base battle scenes
Complete all bridge battle scenes
Complete all bridge builder scenes
Complete all scenes
Achieve everything
Play a 30 minutes base battle
Stomp someone
All players do thumps up
Wear a tower of 4 crowns in ammotoid
Win a bridge battle match without using any guns
Reach wave 20 in base defense with both cores alive
Complete bridge builder without using any background support structures
Complete a race in a custom build vehicle
Reach wave 10 in defendoid
Reach wave 20 in defendoid