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