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