Portal 2

Complete the indicated task to unlock the corresponding Avatar Award.

Complete the indicated task to unlock the corresponding item for purchase at the store.

Bionic Beanie: Complete "Lunacy".
WCC Flag: Complete "High Five".

While attempting to earn the "Ship Overboard" achievement, once you enter the door behind the filing cabinet there are three metal doors in the hallway. If you activate the doors. Cave Johnson talks about the tests. Activate all three doors and the achievement will be unlocked.

Play Chapter 2 "Test Chamber 6". Get the radio that appears in a clump of garbage into a window above the chamber after you hit a button. Work your way back 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 past the window, with radio in hand. Take the radio up to the wall to earn the achievement.

Play Chapter 5 "The Escape" and reach the conveyor belts carrying droids to the incinerator. Use a portal to get onto the conveyor belt. Walk on the belt until a droid with a working laser beam appears. Pick it up to earn the achievement.

Play Chapter 9. After Wheatley's surprise, portal away from the platform just as Wheatley sends arms to crush you. Do not run away on the catwalk. Stay nearby and Wheatly will beg you to come back. Stand at the edge of the pit overlooking his trap. He will ask you to just jump in the pit. Jump in to earn the achievement.

Play Chapter 2 "Test Chamber 7". Keep track of the Companion Cube in this chamber. You can return to get it at the end of the level after using it to depress the button. Ignore GLadOS's comments and carry the cube through the broken "Emancipation Grill" at the end of the chamber to earn the achievement.

Play Chapter 6 "The Fall" and reach the 1958 "28" room. There is a cube is trapped in a glass box and Blue Gel streaming out of a pipe in one corner in this room. Save the game. Shoot a portal under the Gel and over the crate to coat the cube. The cube will bounce until it breaks the glass. It will eventually break out of the glass. Catch this cube before it touches the ground to earn the achievement. Note: Try standing between the entrance and the gel spout.

Play Chapter 6 "The Fall" and reach the 1971-era test facility. Cave will begin talking about testing on hobos. Below one of the test spheres and a giant Aperture logo is a room marked "CONTROL ROOM" in yellow letters. Use a portal to get high above the Control Room and enter the small office. There is a cabinet with a door behind it in the corner of this office. Enter that door and follow the hidden hallway to a dock. At the end of the walkway near the docks is a orange life preserver marked "BOREALIS". Examine it to earn the achievement. Note: This is a reference to the Aperture ship "Borealis" that is seen at the end of Half Life 2: Episode 2.

In chapter 8 when you reach test 15 if you look to the right of where you enter you whill hear wheatley say there is no exit to the test and if you zoom in at the left side of the building that is being pulled apart you will(if looking at the right time) see one of the robots from multiplayer run through the door. I found this by flook.