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My upstairs neighbour who I share the garden with did it with the long bolt headed screws that he just drove into the wood with a percussion screwdriver.
Did he leave the heads sticking out on the surface? It's dead easy to counterbore a hole with a spade bit (13mm I think) that will take the flange and head of those bolts and the required socket will fit in as well, so you can hide them nicely under the surface. I misapplied a couple of those screws putting up my fence and when I moved them I simply cut a plug from a piece of scrap and tapped it flush into the hole to hide it. If you were feeling fancy you could do that with every counterbored hole.
I've seen raised beds lined with DPC to moisture-protect the wood. Obviously the bottom is left open, usually with a layer of rubble covered with a permeable membrane to stop the soil sinking into it and to allow drainage. That's my plan for when I get round to making raised beds in our garden.
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ffm
@Airhead
My upstairs neighbour who I share the garden with did it with the long bolt headed screws that he just drove into the wood with a percussion screwdriver. I'm not a fan of that type of carpentry as I'm a pilot hole and countersink guy (if there's a need for a screw, which is rare in my work). It worked in terms of keeping the sleepers tied together and the heads all sunk below the surface so I guess it's a valid method.
Another thing he did was line the sleepers with slate to help with the moisture retention and stop any creosote from leeching into the beds. I don't really like that kind of raised bed but it's just a question of personal taste.