Here is the full list of all 17 Supraland Demo achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Drive the plot forward
Found Telefrag Upgrade
Found holy sword upgrade
Not even once? Nothing is being cooked.
Found Armor
Reached top of the hill
Found a healthbar
Bought Triple Jump Upgrade
Bought Double Jump Upgrade
Unlocked Speed x2
Got Health Regeneration Upgrade
Bought a Force Cube
Nom nom
Perfect 5/7 experience
Find out what they are up to
The first secret area in the game
Made your first step