Here is the full list of all 12 Time Space and Matter achievements.
Solve Y1.6 without turning on the gravity-unity modifier
Solve B2.4 ensuring the soft cube does not enter any gravity zone
Take a leap of fate in Y3.4
Solve B5.3 on engineer difficulty
Solve Y5.3 on engineer difficulty
Uncover at least 5 fractions of the secret code
Find the shortcut through B5.1
Secret action in level 6
Solve the middle part of SAGRO Test Hall without using the gravity cubes
Unlock the red door
Beat the game in speedrun mode in less than 50 minutes
Finish the assisted speedrun in less than 40 minutes