Names #100, #318 · Viṣṇu Sahasranāma
अच्युतःacyutaḥ
Achyuta — appears 2 times in the stotram, each with its own meaning
Name #100
He who never falls from his own nature
From shloka 11 · chapter Matsya
अजः सर्वेश्वरः सिद्धः सिद्धिः सर्वादिरच्युतः ।
वृषाकपिरमेयात्मा सर्वयोगविनिःसृतः ॥
ajaḥ sarveśvaraḥ siddhaḥ siddhiḥ sarvādiracyutaḥ
vṛṣākapirameyātmā sarvayogaviniḥsṛtaḥ
Also in this shloka: ajaḥ · sarveśvaraḥ · siddhaḥ · siddhiḥ · sarvādiḥ · vṛṣākapiḥ · ameyātmā · sarvayogaviniḥsṛtaḥ
Name #318
Never falling, never failing
From shloka 35 · chapter Narasiṃha
अच्युतः प्रथितः प्राणः प्राणदो वासवानुजः ।
अपांनिधिरधिष्ठानमप्रमत्तः प्रतिष्ठितः ॥
acyutaḥ prathitaḥ prāṇaḥ prāṇado vāsavānujaḥ
apāṃnidhiradhiṣṭhānamapramattaḥ pratiṣṭhitaḥ
Also in this shloka: prathitaḥ · prāṇaḥ · prāṇadaḥ · vāsavānujaḥ · apāṃnidhiḥ · adhiṣṭhānam · apramattaḥ · pratiṣṭhitaḥ