You can get this at the start of the game.
After the intro cut scenes and leaving your room head straight to the kitchen. The table in front of you will have some food. Press LT and your character will focus on the table, if he doesn’t adjust your camera to look at it until it zooms in. Press
and a short cutscene will play where Ryo is a boy. During the cinematic the achievement will unlock.
Thanks to Memoryslave here is some additional info.
If you don't get it right away at the beginning of the game and you find that there's nothing on the table, just wait until you can go to sleep and just after waking up head to the kitchen and food should be there.