Task Achievement in IELTS Writing Task 1 refers to the extent to which a candidate has addressed all parts of the task and presented a clear and relevant overview. In other words, it measures how well the candidate has fulfilled the requirements of the task.

For example, in Academic Writing Task 1, candidates are presented with a visual representation of data, such as a graph or chart, and asked to describe and interpret the information. To demonstrate task achievement, a candidate would need to accurately describe the key features and trends in the data, provide relevant details and figures, and present a clear summary of the main findings.

Let's take an example: A candidate is presented with a bar graph showing the sales figures of a company for the year 2020. The candidate's task is to summarize the information and identify the main trends.

To achieve task achievement, the candidate must accurately describe the key features of the graph, such as the highest and lowest sales figures, the trends in sales over the year, and any significant changes or patterns. They must also provide relevant details and figures, such as the actual sales figures, to support their description. Finally, they should provide a clear and concise summary of the main findings, highlighting any significant points or trends that are evident in the data.