The noun transgression can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be transgression. However, in more specific contexts, the plural form can also be transgressions e.g. in reference to various types of transgressions or a collection of transgressions.

Can if be plural?

The plural form of if is ifs.

How do you use transgressive in a sentence?

Often the films are transgressive and rejected by the audience. The film continued Cavani's interest in transgressive relationships. Her work frequently confronts acceptable normality in transgressive and sometimes provocative ways.