More work stoppages were expected Monday.
ADEDY, the largest union of public-sector workers, scheduled a work stoppage for Monday.
The government says it needs the reforms to receive tranches of bailout aid.
The latest bailout, worth up to 86 billion euros ($104 billion), expires in August.
So far Greece has received 40.2 billion euros, and a new tranche is expected to be worth around 4.5 billion euros.