Completed "The Bank" side quest.


Location: Bank
Prerequisite: Once inside the bank, set the alarm off by going to the vault downstairs and attempting to open one of the deposit boxes.
Best time to complete: While navigating past it, on Lansdale Ave.

Look on your map and you should see the Bank. Head inside. Gather weapons and anything else you think you need, and go down stairs. There is a vault. Inside it, try to open one of the deposit boxes. An alarm will sound and waves of enemies will appear in the lobby. Defeat them all for the achievement. Each wave you get a refresher of items in the vault.

Wave 1: Screamer
Wave 2: 2 Screamers
Wave 3: Screamer and Brawler
Wave 4: 2 Brawlers
Wave 5: Screamer, Brawler, and a Stabber