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Portal 2 has 50 achievements and 52 trophies with a total of 1000 Gamerscore points, 43 bronze trophies, 5 silver trophies, 3 gold trophies and 1 platinum trophy.
In Test Chamber 6, Chell must place one portal above the target Super Button and one on the first slanted surface used to get to the box-releasing button. After pressing the button, the box will land itself on the Super Button. This achievement works in other chambers, too (e.g. chapter 3 chamber 13).
At the end of Test Chamber 07, GLaDOS points out that the Aperture Science Material Emancipation Grill across the exit is non-functional, instructing Chell not to take anything from the test chamber. Removing the Companion Cube from the room by using portals unlocks the achievement. It will be destroyed upon reaching the elevator.
Use an Aerial Faith Plate to launch a turret
This achievement is unlocked by placing a Sentry Turret on an Aerial Faith Plate. The turret doesn't need to be active. This can be accomplished in several test chambers, both in the main campaign and the co-op campaign.
Find the hidden signal in one of the Rat Man's dens
This achievement can be done concurrently with the "Drop Box" achievement. In Test Chamber 6, the trash released on the first button press contains a working radio. The same arrangement of portals used to send the box to the button will also save the radio. The Rat Man's hidden den is above the slanted panels, on the side nearest the door. Going inside with the radio will trigger the transmission and unlock the achievement/trophy.
Near the area where GLaDOS is found, a door hidden behind some objects leads to the docking area of the Borealis. The achievement triggers automatically by walking up to the life preserver near the gate.
There are several steel doors with "Vitrified" painted on them. Examining the intercoms next to them counts toward the achievement. Most are along the primary path to complete the chapter. The final three are in the same area as the Borealis dock mentioned above.
After the first Propulsion Gel test, there is a room blocked by a locked gate in the small area between the last chamber and the next. Portals can be used to access it. Examining the portrait of Cave Johnson and Caroline within causes GLaDOS to comment on her familiarity with them, unlocking the achievement.
To gain this achievement, the player must break eleven monitors used by Wheatley using momentum, turrets, or Thermal Discouragement Beams. There are twelve breakable monitors in total, but only 11 are in the test chambers.
Celebrate your cooperative calibration success
Complete all test chambers in the Team Building co-op course
Complete all test chambers in the Mass and Velocity co-op courses
Mass and Velocity
Complete all test chambers in the Hard-Light Surfaces co-op course
Hard Light Surfaces
Complete all test chambers in the Excursion Funnels co-op course
You Saved Science
Complete all test chambers in all courses of co-op
Story related. The test chambers don't need to be done in order.
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
Mass and Velocity
This achievement is unlocked by catching the cube in chamber six on the first try. This is easiest to do when the cube is dropped right after the player trying to catch it hits the Faith Plate below the Vital Apparatus Vent. The achievement counts for both players, regardless of who catches the cube.
Perform all 8 Gestures of your own volition in co-op
Gestures performed automatically at the end of certain test chambers do not count. Likewise, gestures triggered by one player but involving actions from both only count for the player who initiated it.
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
Hard Light Surfaces
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
This achievement will only work if the gesturing player falls in toxic water after being dropped.
Party of Three
Find the hidden companion cube in co-op test chamber
The Companion Cube is in the final chamber of the course, to the left of the building containing the security disk. To reach it, the player must use the Excursion Funnel to send themselves past the building. A wall will open, showing the cube, before pushing the players into a spike wall. This achievement and "Still Alive" are mutually exclusive.
Place a portal under your co-op partner while they are gesturing
This can be performed in most chambers, but the Hub or the first chamber of Team Building present the most convenient locations. The gesturing player has to fall through the portal to activate the achievement, but unlike Empty Gesture does not have to be killed afterward.
Perform 2 aerial gestures before touching the ground in co-op
This is easiest to perform within an Excursion Funnel or infinite loop.
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Self-explanatory. The total includes portals placed by a partner. The achievement will unlock for both players regardless of who places the portals.
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
To unlock this achievement, the player must physically enter each colored portal without touching the ground. Entering one portal in a pair only counts as one portal. All four need to be entered without passing through the same one twice. This can be accomplished in Chamber 1 of Team Building. Place the yellow and red portals on the floor next to each other. Then place the blue and purple portals above and to the right of the floor portal on the right. By entering the purple portal on the floor, the player will pass through the purple and red portals, hitting the ceiling. Upon falling back through the yellow portal, the blue portal can be switched for the red one, allowing the player to fall through and earn the achievement.
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Mass and Velocity
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
Self-explanatory. The achievement only counts for the winner. The other player has to win three times on their own to get it.
After completing co-op, complete Calibration Course online with a friend who hasn't played before
Self-explanatory. This will not work if the player befriends a random new player during Calibration Course. To activate it, the player must befriend then invite someone who has never played before.
Complete Course 4 with neither you nor your co-op partner dying
Self-explanatory. This achievement is mutually exclusive with "Party of Three".
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
Self-explanatory. The taunt gesture is unlocked during course four.
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
Self-explanatory. Hugs count regardless of who initiates them.
Never lose a cube in Chamber 6 of the Mobility Gels co-op course
Self-explanatory. To catch the cube, place one portal under the Vital Apparatus Vent and the other on the slanted portal surface opposite the ramp. Trigger the cube and have the other player run up the ramp at the same moment to catch it in flight. Once the cube has passed through the portals, move the portal from the vent to one of the two platforms at water level, sending the cube-holder into the air. Then move the portal from the slanted surface to the remaining platform. This will put the cube-holder into a loop so they can destroy the turrets guarding the exit. Once the cube-holder has destroyed the turrets, place a portal on the slanted surface opposite the exit to launch them to the door. Once both players have reached the door, the achievement will activate. The achievement counts for both players.
Portal 2 Platinum Trophy
Collected all other Portal 2 trophies
Self-explanatory. Exclusive to the PlayStation 3 version.
The Sixense Motion Pack DLC prevents the Talent Show achievement from triggering for the player, even though it works for their partner (assuming they aren't also using the DLC). This can be corrected by disabling the DLC using the command "-nosixense" in the launch options.