Here is the full list of all 12 Recourse Demo achievements.
Finish Puzzle Level 0
Dunk a beach ball in any recycler in Payload Level 1
Dunk a beach ball backwards in any recycler in Payload Level 1
Dunk a beach ball in any recycler using Floe's grapple upgrade in Payload Level 1
Finish all levels, collect all question marks and unlock all upgrades for Floe
Have a party in the cave in Puzzle Level 0 with a laser, incinerator, tesla coil, shark and four types of music
Collect the question mark behind the orange door in Puzzle Level 0
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
Eliminate 20 Failbots without using any deployables in Wave Rush Level 1
Unlock the black door in Wave Rush Level 1 without using any barrels
Finish all demo levels