She had only 4 significant accomplishments, which all took place in the final two weeks of her reign:

She bribed and intimidated the Legislature into passing three bills for booze, drugs, and gambling: 
(1) Government-sponsored distillery;
(2) Government opium license for a company to pay $500,000 for monopoly on importing and distributing opium;
(3) Government-operated lottery;
and, of course, her greatest accomplishment of all:
(4) She put an end to the monarchy by getting overthrown when trying to proclaim a new constitution.  For this, her greatest accomplishment, we will celebrate the Hawaiian revolution on its 125th anniversary, January 17.