Elite weapons are locked behind defeating specific bosses. You cannot cheat these without breaking the game.
Locate "Intel" files in enemy camps to reveal weapon case locations on your map. ghost recon wildlands unlock all weapons cheat engine link
If Cheat Engine feels too technical, trainers like WeMod offer a one-click interface for many of the same features, though "unlocking all weapons" specifically may still require a dedicated mod or script. Risks and Warnings Tom Clancy's Ghost Recon: Wildlands [Engine:AnvilNEXT64] Elite weapons are locked behind defeating specific bosses