I was trying to check on that story myself a few weeks back. From what I could find, the version titled 'Codename Anastasia' on Wattpad appears to be marked as completed, but with a really big asterisk. The author seems to have uploaded the bulk of the story in parts, with the final chapter posted a while ago, so it technically has an ending.
However, a bunch of readers in the comments are talking about a sequel or a revised version that was promised but never materialized. So while the main narrative arc is technically wrapped up, it feels more like an abandoned project than a fully satisfied conclusion. The last author update was over a year ago, which usually isn't a great sign for ongoing activity.
It's one of those Wattpad stories where the premise is super engaging—cold war spies, secret identities, all that good stuff—but the follow-through gets a bit muddled. If you're looking for a complete story to read, it's there, but don't expect any new chapters or author engagement.