The XBLA version of Portal - Portal: Still Alive - will be with us soon. In an attempt to drum up support for a game that most of you already own in some form or another, the XBLA version will feature new achievements. Twelve of them (it's a little unclear whether these are all of them or just some) have been revealed by Microsoft, and they run from the easy ("Dissolve a Turret") to the not-so-easy ("Complete the game without ever taking a bullet"). If you're interested in seeing whether these will get you to buy the game again, the full list is after the jump.
Go for the Gold
Win a gold medal on a challenge map.
Out of the Blue
Once you have control of both portals, only enter the orange portal.
Find all the Rat Man Dens.
Is Anyone There?
Complete the game without ever taking a bullet.
Saw that one coming
Cause a rocket sentry to destroy its own rocket when the rocket has been redirected back towards it.
The Camera Adds 10 Pounds
Knock a turret over with a security camera.
Like a Rat
Trap yourself in a test chamber so that GLaDOS has to help you continue.
Feeling like Floating
Dissolve a turret.
Tests like Chicken
Find the chicken's test results.
Beat 5 advanced chambers
Beat 10 advanced chambers.
Vanilla Crazy Cake
Beat all advanced chambers.
Portal: Still Alive - New Achievements [Gamerscore]