The Problem with Blogger Sitemap Files
Ideally, the sitemap file should contain all URLs of a site but if your blog is hosted on blogspot.com (or if you are using a self-hosted version of Blogger with a custom domain), you'll be surprised to know that the default sitemap file (see example) contains only the 26 most recent pages of your blog.
That's a bad thing because some of your older blog pages, that are missing from the system-generated sitemap file, may never get indexed in search engines. There's however a simple solution to fix this problem.
Generate a Complete Sitemap for your Blogger Blog
Step 1: If you haven't done this already, sign-in to your Google Webmasters account and add your blog. For details, check this video tutorial on how to add a blog to Google.
Step 2: Once your blog is added to Google, open the Sitemap Generator and type the full address of your blogspot blog (or your self-hosted Blogger blog).
Once you're Done with adding all th sitemap to the webmaster Your Dashboard should be like this