Whilst story mode is loaded up press
and scroll right using
to the 'Rockstar Editor' menu and press
to enter. Choose 'Director Mode' from here and accept the launch.
Click actors and pick the Story Character 'Cris Fromage' who I assume is unlocked from the kifflom story missions, details here Solution for Kifflom! in Grand Theft Auto V
Once the mode loads the achievement will pop, here's a video