Full list of all 12 Portal: Still Alive achievements worth 200 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Once you have control of both portals, only enter the orange portal.
Find all the Rat Man dens.
Complete the game without ever taking a bullet.
Beat all advanced chambers
Beat 10 advanced chambers
Beat 5 advanced chambers
Win a gold medal on a challenge map.
Trap yourself in a test chamber so that GLaDOS has to help you continue.
Dissolve a turret.
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.
Find the chicken's test results.