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There are 12 achievements for the Xbox Live Arcade release, worth a total of 200 Gamerscore points.

Picture Name DescriptionGamerscore icon.
Portal achievement go4gold.jpg Go for the Gold Win a gold medal on a challenge map 15 Gamerscore points
Portal achievement out of blue.jpg Out of the Blue Once you have control of both portals, only enter the orange portal. 25 Gamerscore points
Portal achievement rats tale.jpg Rat's Tale Find all the Rat Man Dens. 15 Gamerscore points
Portal achievement anyone there.jpg Is Anyone There? Complete the game without ever taking a bullet. 20 Gamerscore points
Portal achievement saw that coming.jpg Saw that one coming Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it. Gamerscore points
Portal achievement 10 pounds.jpg The Camera Adds 10 Pounds Knock a turret over with a security camera. 10 Gamerscore points
Portal achievement like a rat.jpg Like a Rat Trap yourself in a test chamber so that GLaDOS has to help you continue. 20 Gamerscore points
Portal achievement feeling like floating.jpg Feeling like Floating Dissolve a turret. Gamerscore points
Portal achievement test chicken.jpg Tests like Chicken Find the chicken’s test results. 15 Gamerscore points
Portal achievement cupcake.jpg Cupcake Beat 5 advanced chambers. 10 Gamerscore points
Portal achievement fruitcake.jpg Fruitcake Beat 10 advanced chambers. 25 Gamerscore points
Portal achievement vanilla crazy cake.jpg Vanilla Crazy Cake Beat all advanced chambers. 35 Gamerscore points