Chapter 2 Portal 2 - Drop Box (Chapter 2)
Place a cube on a button without touching the cube
Portal 2 - Pturretdactyl and Final Transmission (Chapter 2)
Use an Aerial Faith Plate to launch a turret
Find the hidden signal in one of the Rat Man's dens
Portal 2 - Preservation of Mass (Chapter 2)
Break the rules in Test Chamber 07
Chapter 3 Portal 2 - Overclocker (Chapter 3)
Complete Test Chamber 10 in 70 seconds
Chapter 4 Portal 2 - Good Listener (Chapter 4)
Take GLaDOS' escape advice
Chapter 5 Portal 2 - No Hard Feelings (Chapter 5)
Save a turret from redemption
Portal 2 - Scanned Alone (Chapter 5)
Stand in a defective turret detector