You can find highly-rated save files at these community hubs:
The best save includes the "Grapple Range" and "Grapple Strength" upgrades. You can now hook a fuel tank to a commercial airliner. You can tie a cow to a helicopter. You can build a human slingshot. The limitations of the early game are gone. save game just cause 2 best
Unfortunately, console players have a harder time. The is technically achievable, but it requires "save resigning" tools (like Horizon or Save Wizard) which are against most terms of service. You can find highly-rated save files at these
A save where every base is conquered, every collectible found, and every weapon/vehicle is fully upgraded. Keep in mind that reaching a true 100% completion in Just Cause 2 is technically impossible through normal gameplay due to minor map bugs, so these files often use slight mods. You can build a human slingshot