Kill the indicated enemies to collect the corresponding weapons or items from them.

Weapon	How to unlock
870P Magnum Shotgun	Enemies in Episode 1: Back to School; on a table in a silo in Episode 8: Sovereign Land.
45T Heavy Pistol	Enemies in Episode 3: Gator Bait.
AKM Assault Rifle	Enemies in Episode 3: Gator Bait.
G17 Pistol	Near a truck in a trailer park in Episode 8: Sovereign Land; enemies in Episode 1: Back to School.
M16A3 Assault Rifle	On a couch on top of a trailer in Episode 8: Sovereign Land; in the Domo Roboto basement in Episode 4: Case Closed.
M/45 SMG	At the Gator Farm in Episode 3: Gator Bait, get into the airboat and travel southwest to a dock then climb on a tower with the grappling hook. Look southeast and zipline to another platform.
MAC-10 Machine Pistol	Enemies in Episode 2: Checking Out.
Scout Elite Sniper Bolt Action	From the Nature Reserve in Episode 3: Gator Bait use the airboat to travel south to the dock near the small island. Use the Grappling Hook to reach the ledge, then zipline to another platform to the east to find the rifle on a table.
UMP-45 SMG	In the basement of Domo Roboto Warehouse.
Grappling Hook	From Episode 3: Gator Bait.
Zipline	From Episode 3: Gator Bait.