Yes, you can find achievements while playing in development comments for Portal 2.
Yes, you can find achievements while playing in development comments for Portal 2.
Some sources claim the test subject won't earn any achievements in developer commentary mode, while others explain that achievements remain unlockable except for certain games like Portal 2's Single Player, which simplifies the experience. Commentary nodes won't stop audio or music. The portal wiki seems to align more closely with these details.
You can visit http://www.gamefaqs.com/boards/991101-portal-2/59026818