We are working on a fix
Hello Tadpole,
We have received a bug report notifying us that the Steam achievements are not working
We haven't yet figured out why this is occurring; we have promptly contacted the Steam support and we'll solve this issue as soon as possible.
We'll make sure that the Achievements will get unlocked automatically if you have unlocked frogs in the meantime.
We're so sorry for the inconvenience.
Thank you for your understanding.
With Love,
Black Flamingo Games.