Figment

Story Related. Cannot be Missed. 

When you complete (some) puzzles and defeat enemies, you’ll collect Endorphins (little white orbs). When the meter to the the left of your green health bar gets full, you’ll gain one health point. During the introduction (Outer Cerebrum), you’ll automatically pick up enough Endorphins to fill the meter and earn you the additional health point. 

This trophy will unlock before  Getting back into the game (before you finish the Intro).