General terms:
* Initiative: This is a common word that describes taking action without being prompted.
* Proactive: This emphasizes taking action before a problem arises or a situation requires it.
* Self-motivated: This describes someone who is internally driven to complete tasks without needing external direction.
* Independent: This describes someone who can work without needing constant supervision or instructions.
More specific terms:
* Take the lead: This describes someone who steps up and takes charge without being asked.
* Go the extra mile: This describes someone who goes above and beyond what is expected of them.
* Anticipate: This describes someone who can predict what needs to be done and acts accordingly.
* Take the initiative: Similar to "initiative", but more specifically refers to the act of taking action without being asked.
The best word to use will depend on the specific context and the desired tone.