I beat Portal on the first PC I had it on not too long ago. But, for some reason, I didn't get my achievements for beating it. So today I finally finished it on my current rig, and got those achievements, and only seconds before The Office came on! Talk about good timing :P

Here are the ones I got for continuing the game today:

Lab Rat (Get the Expansion to the Portal Gun)

Fratricide (Kill the Companion Cube)

Partygoer (Escape the Fire Pit)

Heartbreaker (Complete Portal)

----

After that, I got Terminal Velocity (fall 30,000 feet)

and Long Jump (Jump 300 feet)

So there you have it :) Now the only achievements I don't have are for killing all the cameras (I got 27) and beating advanced maps/challenges. I'll get those eventually.