This save game is based on "iceborne ready savegame by AsteriskAmpersand"
you can find it here : Unmodded MHW Complete Base Game Save for Iceborne

this save game created at 2 December 2020

All MR assignment  & MR optional quests completed
All mantle & tools upgraded ( except assassins )
All monsters have also been caught at least once in MR
All 14 kjar weapon available
All canteen ingredient
99% items available ( decoration, ammo, pouch & craft material )

installation :
*Download the SAVEDATA file and extract the SAVEDATA1000 file inside
*Paste the file in your save file folder (C:\Program Files (x86)\Steam\userdata\<YourUserID>\582010\remote)
*Locate your Steam ID:
1.Open your steam profile (by clicking on the little picture on the top right) and copy the whole URL.
2.Visit steamid.io and paste the URL.
3.Click on the red button that says lookup. Copy the number on steamID64.
4.Download steam id changer from here
5.Drag and drop SAVEDATA1000 to steam id changer.exe
6.Replace the steamID with your own, and then press enter.
7.If you want to change character and palico appearance you can use the Character Edit Voucer with FLING TRAINER


For caracter edit, change name and palico name, also change the HR and MR level, you can use fling trainer.
download here : FLING MHW TRAINER

any problem and solution should be the same as AsteriskAmpersand post, just go check there.