Google Play Games achievements not showing

So I've been working on implemtenting GPGS into my game using the official plugin for unity. Authentication and sign in works perfectly, as does posting to the leaderboard. However.... I can't get achievements to work for the life of me. I have more than 5 as is necessary for publishing, and meet all requirements. When I make calls to award an achievement within the app, I get no popup, and nothing is awarded. Additionally, going into the Google play games app, there's no tab for achievements. The game is published in alpha mode. Thanks for any help!