Hint: Weapons
The weapons required for the achievement (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