How do I get item attachment using PnP caml?

SpSouv 

There is no method available where you can get all attachments for all the list items from the list at single go. You need to do individual query for each item to get attachment URLs 

You can use below code to get attachment of particular items:

let item=sp.web.lists.getByTitle("TestList").items.getById(13);
    item.attachmentFiles.get().then((files)=>{
      console.log(files);
    })

Reference Link:

https://stackoverflow.com/questions/59899439/how-can-i-retrieve-a-sharepoint-list-items-attachments-using-spfx

https://pnp.github.io/pnpjs/sp/attachments/

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