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