To create a clip press and hold
and either press
to start a recording or
to turn on action replay mode which records in the background. You can record clips from Story and GTA Online.
Clips must be at least 3 seconds long, once you're happy hold
again and press
to save the recording. The shorter the clip, the quicker the export.
You're now ready to export, whilst in story mode press
and scroll right using
to the 'Rockstar Editor' menu and press
to enter. Note the Rockstar Editor is only available from the story mode. From the Rockstar Editor mode 'Create new project' which will load the editor and then add your clip from the 'Add clip' option.
Press
to exit the timeline and then you're ready to export the clip, choose a name and confirm you wish to export.
You cannot snap and app on your console whilst exporting else it will cancel. Now simply export another 9 clips (can use this one again) to unlock the achievement.
Here's a video showing how to export one
Originally posted by Spilner in the XOne version.