Achievements are important on your resume, of course (I'm always touting achievements), but don't forget to make sure the scope of your position is absolutely clear.
I've seen many resumes from "senior managers" and "operations managers" and often it's hard to tell whether those are store-level assistant manager type of positions, or corporate-level positions with regional or national scope. Remember, not all companies are huge with hundreds or thousands of stores, and not every company is well-known by everyone.
I've seen many resumes from people who have a vague job title and then immediately launch into achievements, and it can be very difficult to understand. So make sure the reader gets a clear description of the scope of your role including store location (if you're a single-unit manager), geographical area and store counts (if you're a multi-unit manager), and so on so they don't misinterpret your job level. You'd hate to be a corporate executive while recruiters thought you were an assistant store manager (or vice versa).
Best of luck!
Check out the rest of my website: