not sure if I'd call all of them soft consonats.
Softening is added by the influence of "i" sound. So of the list I'd say these are soft:
ć, dź, j, ń, ś, ź, dzi
However, in linguistics soft consonants in modern Polish are defined as those whose pronunciation requires the middle part of the tongue to be lifted towards the hard palate. Therefore, the list should be supplemented by: k', g', l' j
(apostrophe denotes softening of the consonnat by the "i" sound)
c, ch, cz,dz, dź, rz, sz are frontal, so they are not soft, but occurence of "i" following some them may produce a soft consonant (for instance ch
Yup, final touches show zeal for mastery :)