All the devotees of Lord
Krsna are called
acyutatma because they follow in the footsteps of
Prahlada Maharaja.
Acyuta refers to the infallible Lord
Visnu, whose heart is always infallible. Because the devotees are attached to the Infallible, they are called
acyutatma.
Thus end the Bhaktivedanta purports of the Seventh Canto, First Chapter, of the
Srimad-Bhagavatam, entitled "The Supreme Lord Is Equal to Everyone."