General Antonyms:
* Compliance: Following rules or laws.
* Obedience: Following orders or instructions.
* Conformity: Adherence to accepted standards or practices.
* Lawfulness: Acting within the bounds of the law.
* Virtue: Moral excellence and righteousness.
* Integrity: Honesty and strong moral principles.
More Specific Antonyms:
* Repentance: Sincere regret for wrongdoing and a desire to make amends.
* Atonement: Making amends for wrongdoing.
* Redemption: Being saved from sin or evil.
* Forgiveness: Granting pardon for an offense.
* Reconciliation: Restoring harmony after a disagreement or conflict.
The best antonym will depend on the specific meaning of "transgression" in the context you are using it.