When do I have to use each one? Accomplish - to bring to its goal or conclusion; carry out; perform; finish For example: I made it my goal to study last night for my test and I accomplished it. Achievement- something accomplished, especially by superior ability, special effort,great courage, etc.; a great or heroic deed For example: His achievement in finding a cure will be helpful to many people who have been suffering for years with that disease.

To achieve means to reach a target. Whereas to accomplish means to complete a task. For example, a student who has studied for their exams will hopefully 'achieve' good grades. However, a worker who is working hard will hopefully 'accomplish' a lot today.