Can't access wp-admin

I’m a just out of tech school and recently just took over the development of an e-commerce site for a small company. We’re using Vagrant on our local side and a vpn host through godaddy. So After making changes to our local version I got excited and pushed my changes to our test sub-domain using ftp. The site on the test domain broke. You can still browse it, but some of the images are broken and worst of all I can’t access the admin of the site at all. I get a 404 message saying the page can’t be found. I’ve been allover google and am still fuzzy as to what I can do to fix it. Help??