Here is my 100% Achievement guide.
Very shortly after getting the
Survival of the Strongest Achievement for climbing out of the drawer without turning the music box one, you will see Josef talking to two policemen.
Go right, and you see a plate with a sandwich on it.. Jump on it and watch the hilarious reaction of the guy and unlock this achievement.
Go to 14:30 in the video to see how and where this is unlocked.
Hope this helps.