Back Stage Pass

Back Stage Pass is an achievement/trophy in The Missing Link DLC for Deus Ex: Human Revolution.

During The long way home mission, you can visit Quinn's shop to get supplies. Once in Quinn's shop, you move some boxes in the backroom revealing a hidden switch. It will open Quinn's secret store, with some guns and weapons upgrades, as well as level 5 Locked Computer. Hacking it will reveal that Quinn is not who he seems to be...