Here is the full list of all 12 Recourse Demo achievements.
Finish all levels, collect all question marks and unlock all upgrades for Floe
Collect the question mark behind the orange door in Puzzle Level 0
Dunk a beach ball in any recycler using Floe's grapple upgrade in Payload Level 1
Dunk a beach ball backwards in any recycler in Payload Level 1
Finish all demo levels
Dunk a beach ball in any recycler in Payload Level 1
Unlock the black door in Wave Rush Level 1 without using any barrels
Eliminate 20 Failbots without using any deployables in Wave Rush Level 1
Have a party in the cave in Puzzle Level 0 with a laser, incinerator, tesla coil, shark and four types of music
Put at least six different shaped objects in the dumbwaiter and let it go up and down once
Collect the upside down question mark by deploying only a single laser to activate the receivers in Puzzle Level 1
Finish Puzzle Level 0