Superhuman mode
Successfully complete Campaign mode on the Hard difficulty setting to unlock the Superhuman difficulty setting.

Hidden cinematic
Successfully complete Campaign mode on any difficulty setting. Then, select "Options" at the main menu and go to "Cinematics". Look for the last movie in the list called "Stranger Than Fission". This is a humorous outtake featuring the scene from the last battle in the game.

Medals
Successfully complete the indicated task in Online Multiplayer mode to earn the corresponding medal. Press L1 or R1 at the character stat screen to view your currently earned medals.

Assassin: Kill consecutive 20 enemies without dying.
Auger Marksman: Kill 100 enemies with the Auger.
Base Defender: Get 2,000 defensive kills across all game modes.
BBQ Chef: Kill 100 enemies with the L11-2 Dragon.
Elite Soldier: Kill consecutive 10 enemies without dying.
Fanatic: Participate in 1,000 online matches.
Fry Cook: Kill 100 enemies with the Arc Charger.
Ghost: Get 100 stealth kills.
Going Commando: Get 100 node or flag captures.
Grenadier: Kill 100 enemies with grenades.
Heavy Weapons Expert: Kill 100 enemies with rockets.
Helping Hand: Get 100 assist kills.
Hero: Play 200 ranked matches and place first at least 60 times.
Insomniac: Compete in 5,000 online matches.
Legend: Play 300 ranked matches and place first at least 100 times.
Marksman: Kill 100 enemies with the M5A2 Carbine.
Martial Artist: Get 30 melee kills.
Nathan Hale: Successfully complete Campaign mode.
Ninja: Get at least 60 melee kills.
Precise Shot: Finish 10 matches with an accuracy of least 85%.
Professional: Get 100 headshots.
Reclaimer: Get 200 node or flag recaptures.
Savant: Play 100 ranked matches and place first at least 30 times.
Sharpshooter: Kill 100 enemies with the L23 Fareye.
Shotgunner: Kill 100 enemies with the Rossmore 236.
Tagger: Kills 100 enemies with the bullseye.
Unerring Aim: Finish 20 matches with an accuracy of least 85%.
Unknown: Compete in 5,000 online matches.
Up Your Arsenal: Get 100 kills with every weapon.

Bonus weapons
Successfully complete Campaign mode on any difficulty setting to unlock the Arc Charger, Backlash Grenades, L11-2 Dragon, Reaper, and Splitter weapons throughout your next game. The Reaper is found near the beginning of the first level when you start a new game. The Backlash Grenades are found in second part of the Manchester level. Go out of the cathedral and through the hole in the wall of the building next to it. When you enter the building, turn left and go through the door. The Backlash Grenades are in the room you are standing in. The Splitter fires a salvo of large rockets. The secondary fire splits each rocket into a wall of mini-rockets. It is similar to the R.Y.N.O. from the original Ratchet And Clank.

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