-HAS to be in one sitting
-NOT cumulative
-CAN be done in sandbox
-ONLY host gets the achievement*
-TRACKER does NOT reset from previous attempts
(i.e. you may think you are at 80% seeing tracker but really you're at 0%)
*Most are reporting both Host & Partner get achievement. My partner and I did not both get it so we must have just been unlucky somehow. If it doesn't pop, simply redo it with the partner as the host instead and it should pop.
Easiest done on Sandbox mode. Start a new game up, invite your co-op partner. Sandbox mode goes on a 72 hour cycle and then psychopaths repeat / recycle. Survivors will also spawn and try to kill you but they do not count as psychopaths. Has to be one of the psychopaths from the story. 8 NPCs on screen rule applies, so if you see survivors bash their skulls in to make room for a psycho! If you're at the right area at designated time and there's no psycho, there's probably 8 survivors running about. If you are unaware how to know the time in the game. Outside in Fortune Park there is a large clock monument that tells the time accurately. 14 total psychopaths on sandbox mode. Psychopaths stay active for 10 hours after starting time and then disappear. Psychopaths that count and the earliest ones that you can find with their locations (which are generally exactly where they are in story mode).
01 - Roger Withers (Magician #1) 7 AM DAY 1 ATLANTICA
02 - Reed Wallbeck (Magician #2) 7 AM DAY 1 ATLANTICA
03 - Chuck Green (Motorcyclist) 10 AM DAY 1 FORTUNE PARK
04 - Carl Sliff (Mailman) 12 PM DAY 1 ROYAL FLUSH
05 - Seymour Redding (Security Guard) 7 PM DAY 1 SOUTH PLAZA
06 - SGT Dwight Boykin (Military Guy) 8 AM DAY 2 UNDERGROUND DOCKS
07 - Bibi Love (Singer) 3 PM DAY 2 SLOT RANCH
08 - Hunter (Sniper) #1 Johnny James 3 PM DAY 2 SILVER STRIP (Royal Flush Rooftop)
09 - Hunter (Sniper) #2 Derrick Duggan 3 PM DAY 2 SILVER STRIP (Atlantica Rooftop)
10 - Hunter (Sniper) #3 Earl Flaherty 3 PM DAY 2 PLATINUM STRIP (Scaffolding near Fortune Hotel entrance)
11 - Hunter (Sniper) #4 Deetz Hartman 3 PM DAY 2 PLATINUM STRIP (Platinum Screens Theatre Rooftop)
12 - Antoine Thomas (Chef) 2 AM DAY 3 FOOD COURT
13 - “Slappy” Brent Ernst (Mascot) 8 AM DAY 3 PALISADES
14 - Randy Tugman (Masked Luchador) 4 PM DAY 3 SILVER STRIP (Swept Away Wedding Chapel)