Was it a multiplayer game you were playing? I've uploaded a new version this evening (1.2.0) that adds support for multiplayer/coop. You could try that new version anyway to see if it fixes the issue you're having - I've tested the singleplayer achievements myself and they're working.
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You could try that new version anyway to see if it fixes the issue you're having - I've tested the singleplayer achievements myself and they're working.
Thanks!