Insert last year's objectives into the second section of your form. This can be "cut and paste" from last year's form if you have it electronically. Alternatively, this will have been pre-populated by the reviewer if you are using the PDR form for Support staff with short term objectives.
Comment on your achievements against each objective. Look at the success measures you captured last year to help you assess your achievements.
Other helpful sources may be:
notes from one-to-ones
notes from interim reviews or performance related discussions
feedback from your colleagues
notes/emails of praise or commendation
your job description
You can use metrics to evidence your achievements. Academic colleagues might look at: publications, research grant success, student feedback, student survey results, peer reviews etc. The use of PURE is encouraged.
If you have a longer-term plan, comment on the impact your recent work has had on this.
