If you mean Acharya in Jainism:

Acharya is a highly respected head of the Jain monk order. He is a disciplined spiritual teacher who follows the Jain vows strictly and guides monks, nuns, and lay followers on the path of Ahimsa, Satya, Asteya, Brahmacharya, and Aparigraha.

Role of an Acharya

• Leads the sangh of monks and nuns
• Teaches Jain scriptures and conduct
• Gives spiritual guidance
• Maintains discipline in the ascetic community
• Preserves the teachings of the Tirthankars

Qualities of an Acharya

• Deep knowledge of Jain scriptures
• Complete self-control
• Strict observance of vows
• Compassion and humility
• Ability to guide others in right conduct

In Jain tradition, an Acharya is one of the most honored spiritual ranks among ascetics.

If you meant Achara in another sense, it usually refers to conduct, practice, or proper discipline in Jain Dharma.