Full list of all 27 Superliminal achievements. It takes around 8-10 hours to unlock all of the achievements in the base game on Windows.
The base game contains 21 achievements, and there is 1 DLC pack containing 6 achievements.
Empty all fire extinguishers
Pull all the fire alarms
Find all blueprints
Find the hidden trophy
Complete all constellations
Make the last move
Congratulations on doing something!
Find all secret chess pieces
Clone an object way too many times
Find the nook in Optical
Beat the game in under 30 minutes
Beat the game in under an hour
Fail at throwing away trash
Place a soda can in a recycling bin
Beat the game
An apple for a head
Drink all sodas
Pull enough fire alarms
Pull one fire alarm
Put a soda can in the wrong place instead of recycling
Break a soda can
Finish the game with developer commentary enabled
Upload a dream to the workshop
Finish all challenges in Challenge Mode
Play someone else's dream
Contribute an item to the Workshop
Import a 3D model into the game