100% Save File. All items. All items are max level. All traits. All traits are max level. All skins. Even all consumables, some cash/scrap and many materials.
No hacks/cheats/mods used! Gained over nearly 250 hours of gameplay.

Just go to AppData/Local/Remnant/Saved/SaveGames, copy all the files in SaveGames folder in case you want to have your old saves or something messes up. Now paste all of my files you downloaded into now empty SaveGames folder and it should work. VISUAL GUIDE:  https://imgur.com/a/0VSCI0W   

The first character is the maxed one. You'll figure it out. It's one with 1000 trait level. This Has All Base Game, Swamps of Corsus and Subject 2923 DLC items and traits and all are maxed.

EDIT;NOTE: You Might Need DLC(s). I am not 100% sure. You could try without them.
ATTENTTION: YOU PROBABLY MUST HAVE SWAMPS OF CORSUS DLC AND SUBJECT 2923 DLC INSTALLED FOR THIS TO WORK! Since saves include SoC & S2923 dlc items and traits. Although for some older files you only need Swamps of Corsus DLC. Each file says what DLCs you need.

WARNING: Using this Will Probably automatically unlock all achievements on steam/etc...

Note: If you have any questions or concerns check the messages/comments/forum section or just ask me if you can't find it there.

How To Install: Go to AppData/Local/Remnant/Saved/SaveGames folder.
Cut all your old files out somewhere for later use if you wish so or just delete all the files in there then paste all of my files into the SaveGames folder.
That's it.

p.s. Only the latest save file has All Items. Older ones are missing some.
Note: Check the messages/comments/forum section for more info on various stuff or feel free to ask me if you can't find the answer there.

Enjoy!

P.P.S. 
if it doesn't work then disable steam cloud saves and place all of my files in savegames EXCEPT steam_autocloud.vdf file

Male Version (thanks to Midboy):
https://www.nexusmods.com/remnantfromtheashes/mods/133