Here is the full list of all 29 Magnetic: Cage Closed achievements.
Acquired a stable version of the D-28 prototype.
Chose the correct number of boxes in "Choice Cube: Remember the Boxes".
Hit both buttons in “The Pit” from the topmost platform.
Take the high road in “Crouch ‘n Climb”
Picked up the D-27 Magnetic Propulsion Device.
Saved XE-47629 from the horrors of the trials.
Granted XE-47629 the opportunity to avoid certain death.
Chose a path in "Choice Cube: Three Paths".
Accepted the Governor’s pardon.
Left confinement without proper escort.
Found the Magnet Gun in Tier 3.
Pick a path in "Choice Cube: A Matter of Trust”.
Pick up the Magnet Gun in Tier 4.
Made a final choice in "Ending: Trust".
Made a final choice in "Ending: Vengeance or Freedom".
Made a final choice in "Ending: Are We Done Playing Games?".
Find all 9 endings.
Complete “Hard WMMPs” in less than 10 seconds, without touching the floor.
Complete “Trick Jump” in less than 8 seconds.
Play through all tiers and pick an ending in under 2 hours & 30 minutes.
Play through all tiers and pick an ending in under 1 hour & 15 minutes.
Complete “3D Puzzle” in less than 60 seconds.
Complete “Seesaws” in less than 20 seconds.
Trigger a spike trap with your body... and survive.
Endure the pains of electricity, poisonous gas and fire in a single level, and live to tell the tale!
Complete “Columnial” without being burnt by any flamethrowers.
Fly all the way to the lever without touching the ground in “I’m Flying”.
Went to the public bathroom.
Complete “Target Practice” without hitting both buttons.