Beat the game (on Normal Difficulty) to unlock the Laser Rifle (for use in Hard Mode only).

You will find it near the skeleton of Monty in the first chapter. The plasma rifle cannot be upgraded and recharges its five shot magazine over time (one second per shot).

Clear the story mode once on its default difficulty level to unlock hard difficulty.

The weapons required for the trophy (kill a dinosaur with each weapon) are:

• .45 Caliber Handgun (Colt 1911)
• 9 MM automatic handgun (Glock 18)
• .44 Magnum Revolver
• 1855 Rifle (Colt Model 1855)
• Black Powder Rifle (Sharpshooter)
• Crossbow
• Shotgun (short barrel)
• Shotgun (automatic)
• 30-06 Auto-Rifle (BAR)
• 5.56 Rifle (SCAR-L/Mk-17)
• Light Machinegun (M249)
• Rocket Propelled Grenade