Achievements unlocks in game like "diplomacy" and stair master but I still have 0 achievements unlocked on steam, why ?

I've got control of Delta Six on the second gun training where you are introduced to being able to target multiple enemies... But I cannot fire the gun at all I poke out, dodging the light - I can use W to switch targets and I can switch sides and come back in and reload but pressing space does nothing I tried remapping the fire key to Z but again pressing it just does nothing and the gun does not fire Am I experiencing a bug or am I missing something?...

I was reminded of this game by a forum thread on another site where people were talking about their all-time favorite games, and I decided to replay it and pick up a few achievements I missed originally. It really is a great game, an all-time classic in the genre if you ask me. I'm playing with commentary on this time, and Joshua Nuernberger comes off as a really thoughtful designer with a lot of good ideas. Does anyone know what he's doing these days and if he's ever talked about why he never made anot...

I can't save my game or access an Options menu. I closed the game and reopened it, but when I choose to load the Autosave, I get a message that says "Unable to restore the saved game".

I bought it within humble bundle, but I can't play on linux. Could you please upload the linux version to steam? Thanks!