"Complete vindication" means being fully cleared or proven innocent of any accusations or wrongdoing, and having one's reputation or actions justified. Full definition
The decision to quash the findings of the initial inquests amounts, in essence, to a full and complete vindication of many of the arguments that the families and campaign groups have been making since 1991. (sbnation.com)
David also won complete vindication for another client in a complicated civil Racketeer Influenced and Corrupt Organization (RICO) Act case that Corporate Counsel magazine called the company's «worst nightmare.» (morganlewis.com)
Apple claimed complete vindication, but I think the verdict is still out on that front. (slaw.ca)