Prithvichandra and Gunsagar are not names traditionally associated with any of the Tirthankaras or prominent Kevalijnanis (omniscient beings) mentioned in classical Jain scriptures. Kevaljnan (omniscience) is a state of infinite knowledge, attained by a soul after destroying all ghati karmas (knowledge-obscuring, perception-obscuring, deluding, and obstructing karmas). According to Jain tradition, there have been countless Kevalijnanis, but the most well-known are the 24 Tirthankaras of the current time cycle (Avasarpini), such as Lord Mahavira, Parshvanath, and Rishabhanath.

If you are referring to a specific Jain text, story, or a regional tradition involving the names Prithvichandra or Gunsagar, please provide more context. Otherwise, based on canonical Jain literature, there is no direct reference to Prithvichandra or Gunsagar attaining Kevaljnan. If you have a different context or spelling, please clarify further.