For a whole list of what you need to do look below.
1. Link your Rockstar Social CLub account to your Google account online.
2. Create a video on Rockstar Editor in GTA 5 and export it
3. Go to the exported video and press space on it to upload to YouTube and select Yes for everything
4. Once the Steam overlay pops up to input your email or phonenumber, copy the URL above in the search bar and paste it into the internet browser of your choice.
5. Continue signing into google through said selected browser.
6. Once completed, go back into GTA 5 and just agree to everything that pops up and your video should begin uploading.
7. Wait for your video to upload and after that you earn the achievement, enjoy!