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A Feeling Like Floating
Dissolve a turret.
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Cupcake
Beat 5 advanced chambers.
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Fruitcake
Beat 10 advanced chambers.
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Go for the Gold
Win a gold medal on a challenge map.
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Is Anyone There?
Complete the game without ever taking a bullet.
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Like a Rat
Trap yourself in a test chamber so that GLaDOS has to help you continue.
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Out of the Blue
Once you have control of both portals, only enter the orange portal.
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Rat's Tale
Find all the Ratman dens.
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Saw That One Coming
Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it.
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Tests Like Chicken
Find the chicken's test results.
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The Camera Adds 10 Pounds
Knock a turret over with a security camera.
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Vanilla Crazy Cake
Beat all advanced chambers.
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