February 06, 2013, 3:40 PM — Here's how you can get Siri to give you a list of commands.
There are two ways to do this:
1. Start Siri then tap the (i) button to see a list of commands.
2. Start Siri then ask her this question:
"what can you do?"
For more, see the original article at the link below.
Get a List of Siri Commands Directly from Siri | OS X Daily