The Scavenger achievement in Call of Duty Modern Warfare 4 comes down to finishing twelve Base Camp repairs during Stranded, the tenth campaign mission. Whether you're considering Modern Warfare 4 Boosting (https://www.u4gm.com/cod-mw4/boosting) or working through the map yourself, keep that target in mind: four weapons and eight tactical items. Picking up supplies isn't enough on its own. You'll need to spend them at the crafting table and complete every required prompt. Check what's available whenever you return, rather than assuming your latest purchase finished the job.
Pick up the Vulcan before heading home
One missing upgrade can leave you wondering what you've overlooked. The Vulcan Sniper Rifle's silencer doesn't appear at the table straight away. Head to the SAM site area, find the rifle, and actually pick it up. Visiting the location alone won't do it. Once you've collected the weapon, return to Base Camp and check the crafting options again. Its silencer should now be available for ten supplies. It's worth handling this early so you don't make another trip after clearing everything else.
Know which repairs need more supplies
Don't spend your last materials without checking the larger purchases. The Mortar and Scoped Light Machine Gun each need thirty supplies, while the Silenced Assault Rifle takes twenty-five. Smaller items are easier to cover, but they still count toward the achievement. The costs below cover several important purchases, not the complete twelve-item requirement. Use them to judge whether another supply run makes sense before returning to camp.
Repair or item Supplies needed
Semtex 5
Pistol Underbarrel Shotgun 5
Vulcan silencer 10
Silenced Assault Rifle 25
Mortar 30
Scoped Light Machine Gun 30
Make each supply run count
Major enemy outposts are your best starting point. You'll usually find fifteen to twenty-five supplies at each, often inside large orange bags in the buildings. Search defeated soldiers too; individual drops add up while you're clearing the area. Then follow nearby question marks and points of interest instead of crossing the whole map for one pickup. There are twenty-six yellow supply crates and fifty-eight hidden notes to find along the way. A thorough sweep can leave you with nearly two hundred supplies after completing the repairs.
Clear an outpost and search its buildings.
Collect dropped supplies before moving on.
Explore nearby markers, then revisit camp.
Check the equipment if completion doesn't register
If all twelve repairs look finished but Scavenger hasn't appeared, try equipping every repaired item at camp. Empty your lethal equipment inventory, then craft those items again at the table so their completion can register. Before you decide to buy Modern Warfare 4 Boosting (https://www.u4gm.com/cod-mw4/boosting), it's worth checking that the Vulcan silencer is unlocked and every repair prompt has been completed. Having materials left over isn't the issue here. The important part is making sure each required item has been made and recognised.