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.
Found Armor
Found Telefrag Upgrade
Nom nom
Drive the plot forward
Found holy sword upgrade
Not even once? Nothing is being cooked.
Reached top of the hill
Bought Triple Jump Upgrade
Found a healthbar
Bought Double Jump Upgrade
Perfect 5/7 experience
Got Health Regeneration Upgrade
Bought a Force Cube
Unlocked Speed x2
Find out what they are up to
The first secret area in the game
Made your first step