I've done in-depth research on this topic, and the only successes I've been able to find were limited to the a period labeled "The Progressive Era."
The exact dates of the Progressive Era are up for debate, but it is safe to say that this period of reform and https://www.reference.com/history/notable-accomplishments-progressive-era-bc9031e24d0e6847
social action lasted roughly from the late 1800s through about 1920.
While the successes listed in that article were attributed to Progressive Liberals, the results would not have happened without at least some support from Conservatives.
Like the song says: "What have you done for me lately?" I don't see any successes attributed to the Progressive Liberals since the 1920s, partially because the Democrats were much more centrist/conservative than today. You can point to successes ushered in by Kennedy and other Democrats, but I don't think they qualify as Progressives nor liberals.
Look at civil rights in the 50s and 60s. The Democrats opposed legislation that protected the rights of minorities, while Republicans pushed that legislation through Congress -- such as desegregation and voting rights. It was only when Democrats finally realized they could "buy" the votes of minorities did they become the "champion" of civil rights.