1) Start new game - any campaign, character or difficulty, they do not matter.
2) After game has begun, type "dipstick". A message telling that cheats are enabled appears.
3) Then type "goto". A level skip menu appears.
4) Scroll down to "Warp only levels" and select "This Causes an Error!"
6) You will see the blue column with faces clipping through walls. Follow it as it clips through the outer wall!
Achievement unlocked!