> How can I write this information in fancy manner in my self appraisal to make it sound more appealing

I'm going to give you the advice I give on resume reviews and performance reviews. I recommend quantifying your contributions. Obviously not every contribution is quantifiable like running scrum or doing code reviews. But having zero numbers in your contributions is unusual. I also expect some more specificity on your accomplishments.  

For instance:

> Worked on XYZ application and delivered it ahead of time. 

By how much did you deliver the application ahead of time? What did you do personally ensure this? It's a pet peeve of mine if someone tries to take credit for a team's effort. Being more specific about your contributions will help. 

> Worked on XXX application and delivered without single issue.

I guess I have a healthy bit of skepticism. I haven't seen any software project deliver without an issue. Is without a single issue actually reality? Did you do enough testing to make sure the end user doesn't get bugs? Or is it that you shipped without any blocker issues? 

> Documented various workflows

Being more specific here helps. Did you document how people should make coffee? Or how GPDR requests are handled automatically? The latter is a lot more impressive than the former.