Make sure you have all or no other achievements, as i'm not sure how much track you are loosing on other achievements.

I can recommend this guide: https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=709977400
If your Headset is getting too hot at some time, cool it down for this period of time or consider to find your own way to split this up. This Guide is for 7 hours straight farming. I am not responsible for any technical issues. :-)

The following steps are resetting the progress of the achievements for the game, but not for steam itself. So if you already have some time on this one, just be patient. Its counts from zero again.

• Go to \Users\<USERNAME>\AppData\LocalLow\Cloudhead Games LTD\The Gallery - Episode 1_ Call of the Starseed\
  (If you can't see the AppData folder, make sure, you activated the 'hidden items'[support.microsoft.com])
  
• Delete the 3 '.dat'-files in this folder. (for me i made a backup of these 3, just to be sure)
  
• Start the game and the beach chapter
  
• Move to the tent and lie down in the center of it
  
• Leave your Headset a little raised on the ground so you don't fade out and get teleported out of the tent (this happened to me even after the bugfix)
  
• Be patient, don't move ingame and wait for the achievement (i went to bed and sleep :D)

Next morning i had my ocean lullaby.