According to Jain tradition, Acharya Bhadrabahu was the last Acharya who knew all 14 Purvas (a Chaturdasha‑purvin / Shrutkevali).

At his time:

• No other Acharya is said to have known all 14 Purvas.
• His main disciple Ārya Sthūlabhadra learned only 10 Purvas from him, so he is called a Daśa‑purvin, not a 14‑Purvin.
• After Bhadrabahu, the complete knowledge of the 14 Purvas gradually disappeared from the Jain Sangh.

So, in short: At the time of Bhadrabahu, he alone is recognized as the knower of all 14 Purvas; there is no second Acharya listed alongside him with full Purva‑jnān.

You can read a simple explanation about 14‑Purvi sadhus here