The reason you may not be able to import your achievements from the browser version and unlock them in steam is because you have the “Cheated cookies taste awful” or “Third-Party” shadow achievements. This guide will tell you how to get rid of them.
 
 

Removing the achievements.

1. If you have more progress in the steam release of the game, export your save, and import it into the browser version – [dashnet.org]  of the game .
2. Open inspect element (ctrl+shift+I in most browsers) and navigate to the console tab. Paste this code into the console
    
    
    

   Game.NoAche=function(what)
    {
    if (typeof what==='string')
    {
    if (Game.Achievements[what])
    {
    if (Game.Achievements[what].won==1)
    {
    Game.Achievements[what].won=0;
    Game.Popup('Achievement relocked :<br>'+Game.Achievements[what].name+'<br> ');
    if (Game.Achievements[what].hide!=3) Game.AchievementsOwned--;
    Game.recalculateGains=1;
    }
    }
    }
    }

3. After pasting the first command into the console, paste the command
    
    
    

   Game.NoAche('Cheated cookies taste awful');

    
    
    
   if you have Cheated cookies taste awful. If you have Third-party, paste the command
    
    
    

   Game.NoAche('Third-party');

    
    
    
   If you have both, use each one at a time.

4. This should have removed the shadow achievements in question from your achievement list. If not, save the game and refresh the page. Then, export the game from the browser version back into the steam version. Save.
5. Now just restart your game and you should get all the steam achievements for achievements you’ve already earned!

 
 
 

Comments and credit

Some of you may be upset that “cheating players” are able to get achievements, but the truth is a lot of us way back when opened the cheat menu just to get the shadow achievement, spawned in cookies, then deleted them. As well, others use mods to, well, enhance their enjoyment of the game. Sorry to upset you.
 
 
Credit to this post by u/hsxp on reddit – [reddit.com]  for the code
 
 

 
 
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