Everyone has certain responsibilities. You should use your responsibilities as a guide when you talk to your boss. The best way is to go through each responsibility and state how you successfully accomplished everything you were responsible for.
If you are a sales person, then the best metric is to use your sales number.
"I have exceeded the average for all sales categories. I was in the top 3 for renewals, I was second in accessory sales, and the most in new services. Overall, I was the first in our store and third in the whole region."
If you are a computer engineer, then it will be a little different.
"I finished all my assignments on time, I fixed the most amount of code errors, I did code reviews on numerous occasion, and I created a program that helped the installation process. This ultimately reduced the installation time by 40%."
Some General Statements 一些一般性的陈述
"I feel I did a great job. I exceeded all my goals, and I made the most sales throughout the year."
"I am very happy with my performance over the year. I completed all my projects and I even took on three additional assignments. I also helped the junior employees on a regular basis."
"I'm happy with my results. The project I have been working on was a success. During the process, I managed to overcome all obstacles and finished on time. We have increased our revenue while decreasing cost."
"I believe I am on track. This year I have learned a great deal. I am very familiar with all our tools and I even completed my first project successfully."
These are general sentences you can say, but if you have a list of accomplishments, you should say them one by one in a paragraph. But make sure you speak clearly and slow enough so the other person can keep up.
"I have accomplished a great deal this year. I analyzed all monthly sales data, wrote up a thorough report for each one, I also created a process of submitting the report form that saved an hour for each report, I worked on four projects that were all successful, and I created a How-To document for new employees." 今年我已经完成了很多事情，我分析了所有的月度销售数据，为每一个写了一份详尽的报告，我也创建了一个提交报告表格的过程，每一份报告节省了一个小时，我在做的四个项目也全部都很成功，并且我为新员工创建了一个指导文档。
This is long, but it is actually very simple. All I am doing is stating each thing right after the other. You should make a list and basically say them all together. It's effective and short.