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FextraBot

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So... from what I have found out on my own there is:

9 Restorative Items
14 Enhancement Items
7 Support Items
73 Materials
75 Key Items
41 Caught Fish

That makes it a total of 219 different Items altogether including every DLC Items as well. That is all Items you will have by the end of the game if you did it 100%

NOTE: There are Key Items related to quests that you will only have during a quest which will be gone once the quest is complete so this list I made excludes those since I counted the items right at the end in the tower
It was pointless of me to make this list (probably) but I am a crazy 100% completionist with Asperger's syndrome so I can't help it xD