You can retrieve a list of stored procedures in a SQL Server database through T-SQL by querying the built-in information_schema partition.
SELECT * FROM db_name.information_schema.routines WHERE routine_type = 'PROCEDURE'
Replace db_name with the name of the database you wish to retrieve the list of stored procedures. You can adjust the WHERE-clause even more to get a more narrow list.
You can also do this with the master database which will return all (system and non-system) stored procedures.