Help needed in N1QL queries- Multiple Joins in Query without Duplication of data

You can also try:

query1:

SELECT c.name, c.email, o AS orders, w AS wishlist
FROM Customer c
     NEST Orders o ON KEYS c.orders
     NEST Wishlist w ON KEYS c.wishlist;

query2:

SELECT c.name, c.email, o AS orders, w AS wishlist, d AS documents
FROM Customer c
     NEST Orders o ON KEYS c.orders
     NEST Wishlist w ON KEYS c.wishlist
     JOIN Documents d ON KEYS c.documents;