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