CheatCodes.com has the complete list of all Portal: Still Alive Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Portal: Still Alive as of Wednesday September 17, 2014 are shown below, or you can print out our Printable Achievements Checklist that shows all Portal: Still Alive Achievements and Gamerscores in a simple quick-reference format.
Find all the Rat Man dens.
Trap yourself in a test chamber so that GLaDOS has to help you continue.
Beat 10 advanced chambers
Find the chicken's test results.
Beat 5 advanced chambers
Knock a turret over with a security camera.
Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it.
Dissolve a turret.
Win a gold metal on a challenge map.
Once you have control of both portals, only enter the orange portal.
Complete the game without ever taking a bullet.
Beat all advanced chambers