What is the noun form of the act of achieving?

The noun form of the act of achieving is "attainment." This term specifically refers to the process of reaching a goal or a level of proficiency, often emphasizing the successful accomplishment of something through effort. It encompasses the idea of not just the final outcome but the journey and effort that leads to that success, making it a fitting choice for the act of achieving.

In contrast, "esteem" refers more to respect or admiration, "affiliation" pertains to a formal connection or association with a group, and "convergence" typically relates to coming together or meeting at a point. These options do not encapsulate the idea of achieving a goal as effectively as "attainment" does.