In contrast, the Lib Dems did manage to pass same-sex marriage (frustratingly, many seem to credit the Tories or Cameron for this despite a majority of Tories voting against it at both readings[1]).
The Lib Dems also managed to block the Digital Economy Bill, AKA the "Snoopers Charter" (the Tories later passed it, once they got a majority in parliament).
The Lib Dem's top priority has always been voting reform, and Clegg seemed to gamble away far too much in an attempt to get it. All they managed was a referendum on a watered-down AV system (AFAIK the Lib Dems want STV, as used by Northern Ireland); which was heavily campaigned against by both Labour and Tories, and failed spectacularly :(
[0] https://general-election-2010.co.uk/2010-general-election-ma...
[1] https://en.wikipedia.org/wiki/Marriage_(Same_Sex_Couples)_Ac...