I am now in the process of testing Steam Achievements in the beta version 0.9.4.5. If you are playing the beta version, you may notice updates, or achievements appearing (or disappearing) or experience some strange things. Fear not. For it is I, the developer, merely testing things out.
You can expect this to go on for the next few days. Then, I hope to update the default game, so everyone can enjoy the new features :)