how to attach a door handle onto wall
You may want to look into towel bars. They are typically designed with one piece that screws into a wall, using an appropriate screw (into a stud or masonry) or anchor + screw (into a hollow wall) and then a second piece that slips over the part in the wall and tightens with a screw around the edge.

However, it you are really set on a handle that only screws in from behind (which is typical of cabinet and drawer handles), then you can:


Cut a piece of wood a couple inches tall and slightly wider than the handle
Paint the wood to match the tile or contrast with it, depending on the tile, trim, cabinets, etc. of the kitchen. Easier to paint the wood before installation than after installation.
Attach the handle to the wood, as if it were a drawer/cabinet front
Locate two studs and use screws to attach the wood to the wall, or use appropriate heavy-duty anchors + screws to attach the wood to the wall.