This one is quick and easy. On the level POLIS
you will meet a man called Miller. After a few conversations you will head into a council chamber which is basically room with a big door which is full of people. Don't walk trough this big door, instead look to your left and you will spot a bar. Walk up to the bartender and start pressing the action button. Keep doing this until he passes out. This wil unlock the achievement. Now you can proceed into the council chamber as you wish, which is hilarious as you are completely wasted.
If you are unsure where the bar is, this quick video shows where to go. Here he also drinks at MARKET
station but this is not required for the achievement to unlock. You only need to drink at POLIS