My mother, who lived in Delhi, passed away during a Char Dham pilgrimage in Odisha. She was brought back to Delhi for her cremation. Could you please guide me on where I can obtain a death certificate?

You can obtain a death certificate from the Municipal Corporation of Delhi where the cremation took place. Alternatively, you can contact the authorities in Odisha where your mother passed away, they may be able to issue a death certificate which you can then have certified by the Delhi authorities.