The phrase "impressive accomplishment" means a remarkable achievement, something that is extraordinary and deserving of admiration or respect. Full definition
This will surely go down as one of the most impressive accomplishments of the human intellect. (discovermagazine.com)
The bible, while an interesting and impressive accomplishment for the time, is rife with factual errors and is obsolete morally. (religion.blogs.cnn.com)
If you do have 20 + years of experience, you have an advantage here, because you can edit your resume to show the most impressive accomplishments of your career. (careerconfidential.com)