In Jain history related to Bhagwan Parshwanath:

• “Achyutendra” means: the Indra (king of gods) in Achyut heaven (Achyut‑kalpa).
• In one of his previous births (purva‑bhav) before becoming Tirthankar, the soul of Bhagwan Parshwanath took birth as a deva in Achyut heaven, and is therefore called Achyutendra in that birth.

Sequence around that time (in brief):

1. First he was Marubhuti (a Brahmin, king’s minister).
2. Later an elephant.
3. Then a deva in Sahasrar heaven.
4. Then Kiranveg (a Vidyadhar / prince in Mahavideh, who did a lot of spiritual practice).
5. After that he was a deva in Achyut heaven – Achyutendra.
6. Then King Vajranabh, then other higher births, and finally
7. Last birth as Tirthankar Parshwanath Swami, who attained Keval‑jnan and then moksha.

So:

• “Now” (in the present time) there is no Achyutendra, because that very soul has already completed all these births, has become Bhagwan Parshwanath, and has attained moksha.
• A liberated soul does not take any more birth, so Achyutendra is not presently living anywhere in the worldly sense.

You can read a simple description of Parshwanath Bhagwan’s previous births here