I found this fairly easy to do after following it on other true achievement sites. For this achievement, it requires the player to destroy 100 heavily armored cyborgs in story mode.
What I had done is get a decently good sword, and put it on easy to kill them quicker. Also used Infinity Wig B to make the process even faster. Red body armor also helps, for easier stealth options.
Go to File R-07. After defeating the enemies outside of the gate, head inside and defeat all of the heavy armor cyborgs (cyborgs with hammers and big armor), both outside the hangar and inside the hangar. Although other guides I have found said not to, you can go PAST the hangar after defeating the enemies in said hangar. this is the last available cyborg you can kill per run of this area. The enemy is after the gate with the security cameras and outside the hangar with three other guards (one being on a catwalk above).
This amounts to a total of 5 heavy armored cyborgs per run. And so, here's where the farming part comes in.
As you may have guessed, it is going to be painstakingly long because is 100 of these enemies. The only way to really cut time off of this is playing through the game multiple times for other achievements, where you may encounter these enemies (for example, in R-03 on the rooftop). What you can do is instead of restarting the mission or exiting to title,
go to the customization screen on your codex. Once you have loaded into the customization menu, exit out of the menu, and back into story mode. What this will do is allow you to respawn back at the first checkpoint (the gate), after you have defeated the guards at the very beginning,
which also saves your progress.
This allows you to do a run through of the area again, with every enemy respawned (excluding the first battle at the very beginning right before the checkpoint).
I am fairly sure that the kills won't count unless your progress was saved, thats why going to customization in the codec is important. Just to be safe, I would
NOT choose the restart or title option, but instead customization. Once you have done so, rinse and repeat until it pops.
TL:DR; Go to R-07, proceed into the area just outside of the hangar and kill all hammer-wielding cyborgs. Then, go into the hangar and do the same. Finally, go past that area one more time and kill the last one that is talking to the two guards outside, right before encountering the cutscene that triggers the boss. Again, this amounts to 5 kills. Do a re-run of the area by entering and exiting the customization menu via the codec.
During the last run (obviously you wouldn't know if it would be your last run or not) you will get the achievement
DURING THE MISSION, NOT AFTERWARDS OR BY COMPLETING THE MISSION. Immediately after killing your last cyborg, it will pop.Guides + Video below are how I got the information to make this guide. I did not make any of these, and the credit goes to each person who made them.
https://www.truetrophies.com/t149/demilitarized-zone-trophyhttps://www.trueachievements.com/a173807/demilitarized-zone-...