Hi,"Objective : To complete the given TASK successfully in time with high quality work, maintaining 100% of safety and security."
I'm new to the forum, so bear with me while I get the hang of things here at UsingEnglish.com.
How does this grab you:
"Objective: To successfully complete assigned tasks in a timely manner, and in a way that demonstrates the highest level of quality and maintains absolute levels of safety and security."
Unless, of course, you actually want to refer to task in the singular (and in all uppercase letters for some unknown reason).
Student or Learner