Perfectionist (noun)

1. A person who refuses to accept any standard short of perfection.
2. A person who is excessively concerned with making things perfect.

Origin:

Late 18th century: from perfection + -ist.

Examples:

1. She was a perfectionist who spent hours on her work, always striving to make it better.
2. He was a perfectionist who would always redo a task if it wasn't done perfectly.
3. The perfectionist in her wouldn't let her submit the project until it was perfect.
4. The perfectionist tendencies made it hard for him to finish any task.
5. The perfectionist attitude made it hard for her to enjoy the process and learn from mistakes.