With the help of "Just Chill"s savegames, I created 3 savegames that can all help you get various achievements very easily.
So very very big thanks to him and his guide:
https://cs2bus.com/sharedfiles/filedetails/?id=1256911456

Link to my savegames is here: Google Drive[drive.google.com]

Savegame 5 will help you get "Up To Task" + Scavanging all locations

Savegame 8 for reducing threat to 0 in Gutgash and Pink Eye territory (+ specifically in the area around the stronghold)

Savegame 9 for getting the V6 + V8 motor

Probably you can milk some more achievements from these!

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To install the saves, put them into:
Steam \ userdata \ [Folder with your SteamID3] \ 234140
(and perhaps not necessarily into:)
C: \ Users \ [Your username] \ Documents \ WB Games \ Mad Max

There are 2 missing task you have to complete!
1. Getting 2000 scrap from scrap crew (1999 already received)
2. Looting all locations (all except for one already done)

First, load the save, then close the game, wait at least 10 minutes and then open it again. That is so that you receive at least 1 scrap from the scrap crew.

Proceed with the following to find the last 2 scraps:

You find yourself in the mission where to rescue glory.
Walk out of the cave and keep on going straight. Don't go to the mission point to investigate!
You'll find the third cave and there are 2 scrap! Collect these and that's it! :)

Savegame 8 - You'll find in Gutgash and Pink Eye territory each one landmine. Defuse them and you'll receive 4 achievements!

Savegame 9 - Just buy the V8 motor! :)

Thanks for checking out the guide
Happy achieving!
(PS: Check out my Youtube)