A "signature accomplishment" refers to the most noteworthy, impressive, and defining achievement of a person or organization. It is often something that stands out and is highly recognized for its significance and impact. Full definition
Teachers have been a problem constituency for Cuomo, who has touted the state - mandated teacher evaluation system and a property - tax cap that limits school districts» abilities to raise revenue as signature accomplishments of his first term. (politico.com)
The reason, he believes, is that fighting corruption is less important to Cuomo than other initiatives he appears to more readily spend his political capital on, like same - sex marriage and a $ 15 minimum wage — among signature accomplishments that Cuomo highlighted by having dozens of guests who benefitted from the laws. (cityandstateny.com)
And perhaps that's why I am so much in favor of supporting President Obama's signature accomplishment with the Affordable Care Act, because I know how hard it was to get that passed, even with a Democratic Congress. (washingtonpost.com)