Unlockable: Drake's Jersey
To unlock a baseball jersey for Drake to wear, head to the Costume section of the game and insert the following code: Left, Right, Down, Up, Triangle, R1, L1, Square.

Unlockable: Making A Cutscene Secret Videos
To unlock secret videos embedded in the Making a Cutscene section of the game, insert the following codes:

Video for Grave Robbing - Left, R2, Right, Up, L2, Triangle, Square, Down

Video for Time's Up - L1, Right, Square, Down, Left, Triangle, R1, Up

Unlockable: Concept Art Secrets
To unlock secrets embedded in the Concept Art, head to the Rewards section of the game and insert the following codes:

Video - L2, Right, Up, Square, Left, Triangle, R1, Down

More Art - Square, L1, Right, Left, Down, R2, Triangle, Up

Unlockable: Crushing Difficulty
To unlock a difficulty harder than Hard Mode (called "Crushing"), you must complete the entire game, all chapters, on Hard Mode without once changing the difficulty level. If you do this successfully, you should be able to select Crushing difficulty during your next playthrough.

Hint: "Unlimited" Ammo
To attempt this, you must have at least three-hundred Medal Points (since this isn't actually a true "unlimited ammo" cheat). When you do, press Start and head to the Rewards menu. From there, head to "Weapon Select" and choose from the weapons available. This will allow you to choose any weapon with full ammunition once selected. Then, all you have to do is go back and forth to this menu, selecting and deselecting the same weapon to constantly refill your ammunition.

Hint: Medals
Below is an extensive list of all of the medals you can earn in the game. Next to the name of each medal is a brief description on how that medal can be earned.

10 Headshots: Kill 10 enemies with headshots
20 Kills Desert-5: Kill 20 enemies using the Desert-5
20 Kills Mk-NDI: Kill 20 enemies using Mk-NDI grenades
20 Kills Wes-44: Kill 20 enemies using the Wes-44
30 Headshots: Kill 30 enemies with headshots
30 Kills Dragon Sniper: Kill 30 enemies using the Dragon Sniper
30 Kills M79: Kill 30 enemies using the M79
30 Kills MP40: Kill 40 enemies using the MP40
50 Kills 92FS-9mm: Kill 50 enemies using the 92FS-9mm
50 Kills AK47: Kill 50 enemies using the AK47
50 Kills M4: Kill 50 enemies using the M4
50 Kills Micro-9mm: Kill 50 enemies using the Micro-9mm
50 Kills Moss-12: Kill 50 enemies using the Moss-12
50 Kills PM-9mm: Kill 50 enemies using the PM-9mm
50 Kills SAS-12: Kill 50 enemies using the SAS-12
100 Headshots: Kill 100 enemies with headshots
Advanced Fortune Hunter: Obtain 35 treasures
Beginner Fortune Hunter: Obtain five treasures
Brutal Brawler: Kill 5 enemies using Brutal Combo
Brutal Expert: Kill 5 enemies in a role using Brutal Combo
Brutal Slugger: Kill 20 enemies using Brutal Combo
Charted!-Crushing: Complete every chapter with Crushing difficulty
Charted!-Easy: Complete every chapter with Easy difficulty
Charted!-Hard: Complete every chapter with Hard difficulty
Charted!-Normal: Complete every chapter with Normal difficulty
Crack Fortune Hunter: Obtain 55 treasures
Dyno-Might!: Kill 3 enemies with a single explosion
Enthusiastic Fortune Hunter: Obtain 15 treasures
Expert Dyno-Might: Kill 3 enemies with a single explosion 5 times
Expert Fortune Hunter: Obtain 50 treasures
First Treasure: Obtain one treasure
Grenade Hangman: Kill 10 enemies using grenades while hanging from a ledge
Hangman: Kill 10 enemies using firearms while hanging from a ledge
Headshot Expert: Kill 5 enemies in a row with headshots
Intermediate Fortune Hunter: Obtain 20 treasures
Master Fortune Hunter: Obtain 60 treasures
Novice Fortune Hunter: Obtain ten treasures
Professional Fortune Hunter: Obtain 40 treasures
Proficient Fortune Hunter: Obtain 30 treasures
Relic Finder: Obtain the Strange Relic
Run-and-Gunner: Kill 20 enemies using firearms without aiming with L1
Senior Fortune Hunter: Obtain 45 treasures
Skilled Fortune Hunter: Obtain 25 treasures
Stealth Attacker: Kill 20 enemies using melee from behind
Steel Fist: Kill 5 enemies with a single punch after weakening them with gunfire
Steel Fist Expert: Kill 5 enemies in a row with a single punch after weakening them with gunfire
Survivor: Kill 50 enemies in a row without dying