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Portal 2 Hints
What do I need to do for that achievement here?
1 of 4: Look for a portal-friendly wall section nearby, on the side of the lift shaft.
2 of 4: Put an orange portal there, then go through it and gently drop down to the walkway.
3 of 4: Use the intercoms that are next to each of the three vitrified doors to make achievement progress. (You won't actually get the achievement until you find three more such doors near the end of the chapter.)
4 of 4: Put the blue portal onto a portal-friendly wall section so you can get back to the top of the metal structure, then put the blue portal back onto the slanty roof section for the portal fling.