[A protester waves a Greek flag during a demonstration outside the parliament building in central Athens]By George Georgiopoulos and Renee Maltezou ATHENS (Reuters) - Greek lawmakers passed unpopular pension and tax reforms on Monday that a European official said marked a major advance in negotiations towards unlocking more rescue funds from the country's creditors. Euro zone finance ministers will hold talks on Greece's progress on economic and fiscal reforms later in the day, and assess if it has met terms of its multi-billion euro bailout. Greece also hopes the sign-off will launch discussions on debt relief, and euro zone officials in Brussels said the finance ministers would discuss how to reprofile its debt to make future servicing costs manageable.