I just rejoined the game after a very long time away, and when I was checking my achievements, it seems I haven't achieved some which I'm sure I have?

One was buying a mutated lion from the trading centre, which I've done many times already, yet it showed up as not yet being achieved. Same with the "getting your first beetle" one still being in progress. I also just got "first time sending a sub on patrol".

Is this a bug? Any help is appreciated