This achievement requires this achievement to be unlocked first:
The Quick fix achievement in Get Even worth 29 pointsSolve the electricity problem properly and let John Lyndon get his kick.
If you did not save John, then you will need to replay this section of the game once you have completed it.
This achievement is unlocked near the end of building C (after the Rose meeting memory and before the 'The Offer' memory). You will come across the party. As you leave the party, enter a door on your left for the door ahead to open. Walk through this and John will be on your left. The achievement will then unlock.