06 Nov 2013
Mission 14 - Sin City
During the mission you will ambush a few enemies after leaving the kitchen area and proceed down a couple of flights of stairs into a large open lobby with a large sand coloured pillar in the centre.
Your team-mate will hold open a metal gete for you to crouch under, but instead locate the 20 Slot machines and shoot out the screen.
Many will have been destroyed in the prior gun battle.
If facing pillar with stairs behind you, 10 in a line and right side, and 2 rows of 5 back to back just right of the pillar.
After they are destroyed head under the gate and proceed to the top of the stairs. Directly opposite is another 5, but we only need 1 to unlock the achievement!