In addition to cash rewards and Resistance Points, some missions unlock special gear and items as well. They are listed below.
Vehicles
Getaway Prepper Stash: Unlocks the 1973 Pygmalion SSR car.
Man Cave Prepper Stash: Unlocks the 2012 Kimberlite TCZ truck with Custom Paint
Hangar Pains: Unlocks the Pack Hunter plane.
Kellett Cattle Co. Outpost: Unlocks The Reaper tractor.
PIN-K0 Radar Station Outpost: Unlocks the KAUMBAT H-158 Sky Scarab combat helicopter.
Copperhead Rail Yard Outpost: Unlocks the 2012 Kimberlite TC6 M-Duty Outlaw gunner truck.
King's Hot Springs Hotel Outpost: Unlocks the 1987 Bruelag car.
Baptism of Fire Clutch Nixon Stunt: Unlocks the Uncle Sam car.
Grill Streak Side Mission: Unlocks the 3012 Adjudico Mastodon XZT gun truck.
Make Hope Great Again Story Mission: Unlocks Nancy, a gunner SUV.
The Widowmaker Story Mission: Unlocks the Widow Maker, a big rig with mounted guns.
The Atonement Core Story Mission: Unlocks The Dogfighter plane.
Wrath Core Story Mission: Unlocks the Affirmation fighter plane.
Death Wish Story Mission: Unlocks the Death Wish gunner SUV.
Air Raid Story Mission: Unlocks Nick Rye's Carmina seaplane.
Eco-Warriors Story Mission: Unlocks Adeline's Tulip helicopter.
Baptism of Fire Stunt: Unlocks the Uncle Sam car.
Quadzilla Stunt: Unlocks the Shining Sea jetski
Mooseknuckle Run Stunt: Unlocks the Quad-State Area quadbike
Spray and Pray Stunt: Unlocks the Stars and Stripes seaplane
Descente Dans La Folie Stunt: Unlocks the Bailout truck.
Outfits
Swingers Prepper Stash: Unlocks the Deer Season outfit.
Foxhole Prepper Stash: Unlocks the Militia outfit
Overwatch Prepper Stash: Unlocks the Flight Crew outfit.
Whitetail Park Ranger Station Outpost: Unlocks the Cowhand outfit.
Seed Ranch Outpost: Unlocks the Speeder outfit.
Lorna's Truck Stop Outpost: Unlocks the Badass outfit.
FANG Center Outpost: Unlocks the Esssentials outfit.
Quest on the Set Side Mission: Unlocks the Omega outfit.
Special Delivery Side Mission: Unlocks the Rye and Daughter shirt.
Prairie Oyster Harvest Side Mission: Unlocks Testicle Festival shirt.
Grand Slam Collectibles Side Mission: Unlocks Cougars T-Shirt.
Mint Condition Collectible Side Mission: Unlocks Cheeseburger T-Shirt
Old Glory Holes Stunt: Unlocks the Overdrive outfit.
Expendables
Playing With Fire Prepper Stash: Molotovs require fewer components to craft
Green-Busch Fertilizer Co. Outpost: Ultimate Survivor homeopathic requires fewer components to craft.
Fast: The Fast homeopathic requires fewer components to craft.
Furious: The Furious homeopathic requires fewer components to craft.
Nature Provides Side Mission: Buffs the Ultimate Hunter homeopathic.
Blow Their Mine Story Mission: Dynamite requires fewer components to craft.
Dinner Time Story Mission: The Ultimate Hunter homeopathic requires fewer components to craft.
Sins of the Father: Buffs the Ultimate Survivor homeopathic.
War on Drugs Story Mission: Buffs the Ultimate Hunter homeopathic
Clinical Study Story Mission: Bait now attracts Angels
Weapons & Gear
Walk the Path Core Story Mission: Unlocks the Sin Eater sidearm.
Only You Core Story Mission: Unlocks Jacob's Rifle.
Out of this World Side Mission: Unlocks the Magnopulser special weapon.
The Admiral Side Mission: Unlocks the Wonderboy Fishing Rod.
Weapon Skins
Vespiary Prepper Stash: Unlock the Gold Medalist weapon skin.
Patriot Acts Side Mission: Camo skin for the SMG-11
Music
Turn the Tables Side Mission: Unlocks new radio music for Wheaty's station.
Perks
Razing the Steaks Story Mission: Makes the Master Blaster Perk available.