It's very hard and more or less impossible to actually create embroidery file like TAJIMA DST from a bitmap source like TIFF with some common graphics editor, which is what tiff to dst conversion represents. It is because embroidery files are special vector based images with instructions for the stitching machine.
Nonetheless an experienced graphics designer might be able to create embroidery design from some image. This is done with usually expensive digitizer software. Some embroidery software can also possess basic digitizing function that can convert raster image to embroidery, but that's usually far from perfect.Open TIFF file Open DST file
An embroidery designs manager
A set of applications used by professional graphic designers
An embroidery digitizer