"Perfect attendance" means not missing any school, work, or other scheduled activities. It means being present and showing up every time without any absence or tardiness. Full definition
For example, if you received an award for perfect attendance in school or at a job, include this. (thebalance.com)
For example, publicly honor the winning debate team, the kid who won the art poster contest or the class with perfect attendance for a week. (edutopia.org)
Beyond my calm personal exterior, I am also a responsible employee who has received perfect attendance awards for four straight years. (iresumecoverletter.com)