Developing for Steam for the first time is challenging in a few ways, and one of those ways is getting achievements working properly. We've tightened up our playtesting process considerably, but a few particularly pernicious bugs slipped through before we did:

• An early bug that would crash the game, and unlock all achievements, if preferences we set in a specific way.
  
• A file sync issue, that would unlock nearly all achievements after having played the affected version.
  
• Achievements carrying over from playing non-Steam versions of the game, rather than unlocking organically.
  

Unfortunately the only way to properly fix these involves resetting cheevie progress for everyone - and, after a lot of thought, that's what we've decided to do. I hate doing things like this, but I figure it's best to rip the band-aid off while we're still relatively early on the platform!

This change will give a lot more people the chance to properly enjoy the achievement system we've set up, and hopefully the rest of you won't mind the opportunity to play through it again :) We'll continue to add new achievements as we update, and there becomes ever more to discover.