Get the Gas Stamps with no Alarms or Cops - The Professional Achievement - Mafia 2 Game

So... you're in Chapter 3 of Mafia 2 - Enemy of the State - you got a job to steal some gas stamps from a federal building - and you either fail because the guards get you - the police show up - you set off an alarm... I get it. You may also want to get The Professional Achievement which means getting in and out with no guards catching you - no alarms - no police. Got you covered.