Answer

If you mean the Jain 18 pāpasthānas (eighteen sources of sin), they are traditionally listed as: violence, falsehood, stealing, sexual conduct, possessiveness, anger, pride, deceit, greed, attachment, hatred, quarrelling, false accusation, backbiting, liking/disliking over trifles, defamation, deceptive false speech, and false belief. Jain Pratikraman texts present these as sins to avoid and to ask forgiveness for. ( jainelibrary.org)

Explanation

If by sañjñā you meant the Jain basic instincts, Jain tradition commonly speaks of four basic instincts: eating, fear, copulation, and possession (mine-ness). ( jaina.org)

Spiritual Understanding

In Jain Dharma, this teaching is meant to make a person more self-aware, less harmful in thought, speech, and action, and more sincere in repentance. That is why pratikraman is used to confess and cleanse sinful actions. ( jainelibrary.org)

Takeaway

So, if you meant 18 sins, the term is 18 pāpasthānas; if you meant sañjñā, Jainism usually speaks of 4 basic instincts, not 18. ( jainelibrary.org)