If what you mean by retail store is clothes with "York University" on it than yes, York does have a retail store. It is located in York Lanes, in the York University Bookstore. There you can buy a variety of York clothes from sweatpants to sweaters, shirts, baby clothes, acccessories, and many others.

In terms of other retail stores at York, there are random stores that may sell clothes and some faculties have their own store (for example Schulich has its own store inside its building).

yes you can return store clothes to the retail store

There is little difference between a retail store and a department store. A retail store offers many brands and products designed as a single store. A department store is normally one brand or company but may be a part of a larger retail establishment such as a mall.

you need to search online the check in which retail store it is available.

As a retail store manager, your achievement would be to make the retail store a success. Other achievements may include increased sales and good employees.