Achievement Hunter: Portal 2

Portrait of a Lady

SPOILERS: The final image of this walk-throw may be consider a spoiler. You have been advised.

This achievement is obtained at the beginning of the 7th chapter, after the first test.

After completing the test, exit through the door and stop.

Then, shoot a portal to the white panel to your right and the other to the panel behind the close metal door. Then go through them.

Now you will find a small office and the portrait is in there. Look at it, and you will receive the achievement and a special dialog.

Hint: Most of the achievements unlock extra fun dialogs that are not heard in the normal campaign. For more info about it, read the Portal 2 review (In progress)