Quid Pro Quo is an achievement/trophy in A Criminal Past expansion for Deus Ex: Mankind Divided. It is awarded for giving alcohol to the inmate found at the doorway to the yard of Cell Block A.
Walkthrough[]
The easiest way to find alcohol is to search the cell A-305 on level 3 - there is a bottle of Old Man's Prestige in a box under the bed.
Once you have alcohol, head to the exit to the yard and talk to the guy at the left of the doorway. He asks for alcohol in exchange for Multi-Tools. Trade with him to get the achievement.
Trivia[]
"Quid pro quo" is a Latin phrase that means "something for something" or "this for that".