Here is the full list of all 12 Magnetic Structures achievements.
Congratulations! You 've Managed to Move the First Ball
Congratulations! You 've Managed to Move the First Rod
Congratulations! You 've Made The First Structure
Congratulations! You 've Made The Triangle Structure
Congratulations! You 've Made The Diamond Structure
Congratulations! You 've Made The Spider's Web Structure
Congratulations! You 've Made The Pyramid Structure
Congratulations! You 've Made The Colourful Pyramid Structure
Congratulations! You 've Made The Daisy Structure
Congratulations! You 've Made The Red Pyramid Structure
Congratulations! You 've Made The Spacecraft Structure
Congratulations! You 've Made The Big Pyramid Structure