Requirements
To unlock this achievement, the player must knock down all five of the character stands in the level Homicide (the 2nd level). The stands are easy to knock down with either melee or guns. The easiest way to do this is at the end of level when all enemies have been cleared out.
Stand Locations
First floor (3): One stand is located next to the bottom right corner of the middle room. One is directly above the desk in the middle of the right part of the room and the final stand is between the two soccer ball boxes/crates at the top left of the room near the elevator.
Second Floor (2): One stand is located in the lower room with wooden planks next to the garbage bags. The other is in the top right of the large room to the right near boxes and shelves.
Source:
https://hotlinemiami.fandom.com/wiki/NUCLEAR_WASTE