- Alternate title screen
Successfully complete the game to change the title screen.

- Trophies
Successfully complete one of the following tasks to get a trophy:

Bronze Trophies
Scanned Alone	Stand in a defective turret detector.
White Out	Finish the first Conversion Gel test.
Preservation of Mass	Break the rules in Test Chamber 07.
Still Alive	Finish Course 4 with neither you nor your co-op partner dying.
Wake Up Call	Survive the manual override.
Pit Boss	Show that pit who's boss.
Tater Tote	Carry science forward.
Empty Gesture	Drop your co-op partner in goo while they are gesturing by removing the bridge under them.
Undiscouraged	Finish the first Thermal Discouragement Beam test.
Portrait of a Lady	Find a hidden portrait.
Confidence Building	Finish all test chambers in the Mass and Velocity co-op course.
Obstacle Building	Finish all test chambers in the Excursion Funnels co-op course.
Bridge Building	Finish all test chambers in the Hard-Light Surfaces co-op course.
Four Ring Circus	Enter 4 different portals without touching the ground in co-op.
Party of Three	Find the hidden companion cube in co-op test chamber.
Good Listener	Take GLaDOS' escape advice.
Stranger Than Friction	Master the Propulsion Gel.
Iron Grip	Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
Tunnel of Funnel	Master the Excursion Funnel.
Gesticul-8	Perform all 8 gestures of your own volition in co-op.
Dual Pit Experiment	Do the same test twice.
SaBOTour	Make a break for it.
Portal Conservation Society	Finish Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements.
Pturretdactyl	Use an Aerial Faith Plate to launch a turret.
Smash TV	Break 11 test chamber monitors.
The Part Where He Kills You	This is that part.
You Made Your Point	Refuse to solve the first test in Chapter 8.
Vertically Unchallenged	Master the Repulsion Gel.
Air Show	Perform 2 aerial gestures before touching the ground in co-op.
High Five	Celebrate your cooperative calibration success.
Asking for Trouble	Taunt GLaDOS in front of a camera in each of the five co-op courses.
Team Building	Finish all test chambers in the Team Building co-op course.
Bridge Over Troubling Water	Finish the first Hard-Light Surfaces test.
No Hard Feelings	Save a turret from redemption.
Can't Touch This	Dance in front of a turret blocked by a hard light bridge in co-op.
Final Transmission	Find the hidden signal in one of the Rat Man's dens.
Schrodinger's Catch	Catch a blue-painted box before it touches the ground.
Stalemate Associate	Push the button!
Ship Overboard	Discover the missing experiment.
You Monster	Reunite with GLaDOS.
Door Prize	Examine all the vitrified test chamber doors.
Triple Crown	Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each.
Silver Trophies
Overclocker	Finish Test Chamber 10 in 70 seconds.
Drop Box	Place a cube on a button without touching the cube.
Friends List With Benefits	While playing co-op, hug 3 different people on your friends list.
Narbacular Drop	Place a portal under your co-op partner while they are gesturing.
Rock Portal Scissors	Be victorious in 3 co-op games of rock-paper-scissors sequentially.
Gold Trophies
You Saved Science	Finish all test chambers in all courses of co-op.
Lunacy	That just happened.
Professor Portal	After completing co-op, complete Calibration Course online with a friend who hasnâ??t played before.
Platinum Trophies
Portal 2 Platinum	Acquireed all other Portal 2 trophies.

- Singing turrets
There is a turret inside a ventilation grate just past the elevator in Test Chamber 16. Jump over it, get the Refraction Cube, then use the laser to destroy that turret to open the grate. Enter the new area to find four turrets singing a song.

- Bonus store items
Successfully complete the indicated task to unlock the corresponding item for purchase at the store:

Bionic Beanie	Successfully complete 'Lunacy'.
WCC Flag	Successfully complete 'High Five'.

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