Maybe I should rephrase. Is this mission a scientific achievement? It could be a economics/accounting/marketing/HR/logistics achievement, but what is new scientifically?
The thing about spacecraft is that there is a huge engineering component. The s/c is in a novel environment (vacuum, radiation, cold) and many systems have to work together. You have to figure it all out in advance, using first-principles physics and modeling, and design and build a system that works without further manual intervention. Just getting it there intact is a significant achievement in systems engineering.
Technology demonstration is what this mission was about.