In Chapter 6: The Fall, there are six sealed metal doors marked VITRIFIED ("Vitrified Doors") that have buttons in front of them that play unique audio clips of Cave speaking. At the beginning of Chapter 6 you'll have to penetrate the 1960s Aperture facility. After flying through the Aperture logo you'll come to an area with a tall elevator. You must use the elevator shaft as a gravity boost to get across a chasm. On one end of this chasm is a platform with three of the Vitrified Doors. Listen to the audio that plays when you hit the buttons in front of each of the sealed doors.

Now, play through the level until you get to the 1971-era test facility. At this point, Cave will start talking about testing on hobos and you'll know you are in the right area. Below one of the test spheres and a giant Aperture logo in its 70s cooper Black Font is a room marked CONTROL ROOM in yellow lettering. You can use a portal to get high above the Control Room and enter a small office. In the corner of this office is a cabinet with a door behind it. Enter this door to find a secret hallway that leads to a dock (see Ship Overboard Achievement /Trophy). The final three Vitrified Doors can be found here. Watch the Door Prize Video here.

For this Achievement / Trophy, go to Chapter 2, Test Chamber 6 (same room as Final Transmission). After you hit the button for the trash, shoot a portal at the first slanted platform you enter, and the look at the button where the cube is meant to go. Above it is a white wall. Shoot your second portal there. Press the button for the cube to drop and you'll get the Trophy / Achievement earned.

Alternate Strategy from Edd Ryves: You can also get this in Chapter 3 in the area where you first encounter the turrets. The last part of the test area has 3 cubes in it. Use 2 cubes to defeat the turrets in the room but do not touch one of the 3. when you have got the room cleared stand on the button and shoot a portal directly up, then return the the unmoved cube and shoot a portal directly underneath it and presto!

Finally, you can check out a video fo us getting Drop Box right here.

Final Transmission can be found in Chapter 2, Test Chamber 6. You need to carry a radio -- which shows up in a clump of garbage after you hit a button -- into a window above the chamber. After you get the radio, backtrack through the level and place a portal on the pad across from the window. Use the launchers to get through the portal and into the room beyond the window with radio in hand. Once there, carry the radio up to the wall to receive the Final Transmission Achievement / Trophy. Check out the Final Transmission video.

To get this Trophy / Achievement, head to Chapter 4 The Surprise, Test Chamber 21. Do the test and when your walking across the bridge the lights and bridge will cut off. Wheatly will pop through the wall busting you out of there. Run along the path given and at one point a chamber will open and a light bridge will lead you to the room. GLaDOS goes on talking about come back and you can see the deer if you go into that chamber. Once you do she will kill you with gas and then you get the Trophy / Achievement

No Hard Feelings can be found in Chapter 5: The Escape, play through the level until you come to the conveyor belts carrying droids to the incinerator. Use a portal to get onto the conveyor belt and walk it until a droid with a working laser beam appears. Pick it up for the No Hard Feelings Achievement /Trophy.

Solving this room in 70 seconds is tough, but we did it -- you can watch the Overclocker Video here.

You can get Pit Boss at the beginning of Chapter 9. After Wheatley's Surprise, you'll need to portal away from the platform just as Wheatley sends a bunch of arms to crush you. Instead of continuing to run away on the catwalks, stay nearby. Wheatly will plead with you to come back. Stand at the edge of the pit overlooking his trap and he will ask you to just jump in the pit. Do so for the Pit Boss Achievement / Trophy. Check out the Pit Boss Video.

The Portrait of a Lady Achievement / Trophy is found in the beginning of Chapter 7: The Reunion. On the catwalks between tests 1971-01 and 1971-02, while facing the entrance to the 02 room, place a portal on the wall to your right and look for another pad you can shoot a portal onto through the gate and past the stairs to the left. On the other side of the portal is an office with a large portrait of Cave Johnson and, presumably, Caroline. Stare at the portrait and GLadOS will comment on it, giving you the Achievement / Trophy. Video for Portrait of a Lady.

Preservation of Mass can be completed in Chapter 2, Test Chamber 7. Keep track of the Companion Cube in this chamber and you can return to grab it at the end of the level after using it to depress the button. Ignoring GLadOS's admonishments and carry your pal through the broken "Emancipation Grill" at the end of the chamber to get this Achievement / Trophy. Check out the Preservation of Mass video.

To get the Pturretdactyl Achievement / Trophy, go to Chapter 2, Chamber 6 and push the button. One of the pieces of trash that falls out of the chute is a defective turret. Pick it up and portal to the beginning of the level, launch it off the Faith Plate for the Achievement / Trophy.

In Chapter 5: The Escape, head to the area where the turrets are being manufactured from a template. After you remove the turret from the "template scanner," stand in the scanner and let it scan you once.

For Schrodinger's Catch, start Chapter 6: The Fall, play through the level until you reach the 1958 28 room. In this room a cube is trapped in a glass box, while Blue Gel streams out of a pipe in one corner. make a save when you enter the room so you can reset the puzzle if you need to. You must shoot a portal under the Gel and over the crate to coat the cube in goo. The cube will then bounce around until it breaks the glass. Eventually it will break out of the glass. To get the Schrodinger's Catch Achievement / Trophy you must catch this cube before it touches the ground. Stand between the entrance and the gel spout and just hope the cube comes flying your way. It may take a few tries! Video for Schrodinger's Catch.

For Ship Overboard, play through Chapter 6: The Fall until you get to the 1971-era test facility. At this point, Cave will start talking about testing on hobos and you'll know you are in the right area. Below one of the test spheres and a giant Aperture logo in its 70s cooper Black Font is a room marked CONTROL ROOM in yellow lettering. You can use a portal to get high above the Control Room and enter a small office. In the corner of this office is a cabinet with a door behind it. Enter this door to find a secret hallway that leads to a dock. At the end of the walkway by the docks, you'll find an orange life preserver marked "BOREALIS." Examine this to get the Achievement / Trophy. This is a reference to the Aperture ship Borealis seen at the end of Half Life 2: Episode 2. Video for Ship Overboard.

The 11 monitors you can destroy in Chapter 8 are those that broadcast Wheatley in the 10 puzzles (two monitors can be found in one puzzle). The monitors can be busted with falling blocks, lasers and one must be taken out by catapulting bodily into it. Here's a convenient video showing how to destroy all 11 monitors: Video for Smash TV.

To get this Achievement, head to Chapter 8. Enter the first "real" test chamber (after the room with the malfunctioning robots). Walk into the room until Wheatley starts to talk and simply wait. After a minute or so -- Achievement Unlocked!