Manahparyaya jñāna is attributed in Jain tradition to highly advanced ascetics (munis) who have reached a very pure stage of spiritual development. It is not commonly attributed to ordinary householders.

Can a śrāvaka achieve it?

Generally, no. In Jain doctrine, manahparyaya jñāna is attained by a renunciant life, with deep vows, restraint, and purity of mind. A śrāvaka is a lay follower, and while a śrāvaka can practice great discipline, this jñāna is ordinarily not considered attainable by a householder in that state.

In simple terms:

• Who attains it?

Usually munis / sadhus of very high spiritual purity.

• Can a śrāvaka attain it?

Not ordinarily. It is associated with complete ascetic discipline.

If you want, I can also explain the difference between avadhi jñāna, manaḥparyaya jñāna, and keval jñāna in simple Jain terms.