Here is my 100% Achievement guide!
Around halfway in chapter 3, you can enter a ham shop (Mr Lawrence's to be precise).
As you enter, look at the lower right part of the screen and you will see an abundance of meat just smashed together.
Click on it and you enter a new screen.
Now simply put any parts of meat where and how you want to make a little meat friend then click on the camera and achievement unlocks
Go to 48:15 in my video to see rhe start and how to unlock this
Hope this helps!