Almost Number One:
Bring the Hunter down to 1 healthpoint in melee combat.
How to Earn Edit
In The Beach level, after defeating the hunter for a second time by shooting him, fight the Hunter with his hand behind his back until he goes down to 50% health.
After this, he'll throw sand in your eyes and use both his hands. The key is not to get close to him, if you do he will grab you and end the fight. Fake him out with a non-charged strong punch and then try hitting him with a charged strong punch (S+MOUSE2). If that does not work try meleeing him with a normal punch to interrupt his charged attacks followed by a strong punch. If you get him on the ground make sure to kick him as much as possible but get out of the way once he's up so he doesn't end the scene.