There is nothing attached.
I assume you just have AutoCAD and not Civil 3D?
Is it a point shapefile?
Are the coordinates projected or geographic?
If it is a point shapefile, It is easy with QGIS.
1. Load the data in QGIS;
2. Open the field calculator;
3. Create a new field;
4. Under geometry, there are a $X and $Y;
5. You should get the coordinates, in the DBF file.
Attach the data, and I will have a look at it.