In Sector 6, the first puzzle is just pushing a cable with a red block, to unlock a second red block to cross a gap with. After this, you'll jump in an elevator and head down, then continue to the next puzzle. Skip completing the second puzzle entirely! Instead, head into the area, and when you're looking at the large pit, turn to the right and you'll see some rubble in the corner.
Jump up this rubble, then jump over to the the right wall heading around the pit towards the sloped ramp. You can follow the small ledges sticking out from the wall around the pit and to the sloped ramp. Follow this ramp all the way up, and you'll see some stairs heading down. Follow the stairs, and at the bottom you will see a picture of the devs!
Being in the same area as this picture unlocks this achievement, clicking on the picture (attempting to extrude) unlocks the "You can't bring them here!" achievement as well.
Yes, you can skip puzzle 2 entirely by this method