Achievement and effort lead to productivity, and productivity is defined as executing work to achieve results, technically it is expressed as the ratio of input to achieve the desired output, often used in production processes. Nowadays it can also be used a measure of an employee's work ethic.
A strong achievement and effort score is needed for roles that require personal ambition and hard work in achieving work-related goals. The outcomes or results from the person who is exerting effort towards mastering tasks can be measured by their productivity and success. If employees are rewarded for their achievement and efforts, they are motivated to work more productively.
Employee productivity is often linked to employee happiness and engagement. If a person is able to accomplish work more effectively and efficiently, with tools and support at their disposal, they feel they have added value and accomplished something with their day. Consequent rewards, recognition, and advancement opportunity will thereby increase employee happiness.