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...
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