I usually use:
q=oscar-reyes+site%3Astackoverflow.com, but that yields bot questions and answers.
Does anyone have a way to identify only answers ? ( or only questions? )
This gets you the first 1,000 answers. The API will not provide more than 1,000 answers at one time. You can probably increase the page to 2 for users who have more than 1,000 questions.
Here's a reference to the current API implementation of the answers request:
(Linked to avoid having to update more than one place for API info)