This guide is originally written by
ForgottenWolf x from TrueAchievements and a bit edited by me.
This is probably one of the last trophies you need but the trophy description is pretty misleading cause it says 15 but you need 15 survivor encounters. I had the trophy unlocked at 24 survivors rescued and it popped for me when I grabbed the rewards so do not forget to grab the rewards if you saved them. This could be patched but I don't know so if it gets patched please let me know in the comments.
These encounters are the most random events out there and there is no 100% certain way to spawn them but this method comes close to 100% (At least it did for me). Also this is way easier to do then trying them in an end game in Old Town where there is like no certainty besides RNG.
Guide;I've found a good way for this trophy, It's some kind of route on the map
(Slums) that can easily spawn these ''Rescues''. All You need to do is reach the fourth main-mission named
Pact With Rais and then keep completing the objectives till you reach the objective ahead:
Find a Telecommunication Antenna. Here you can stop doing the mission !
Now, what you need to do is to keep walking the route on the map below showing the possible respawn points on the map!
Big Red Circle = Keep walking through this area trying to find the ''Rescue'' over and over again till 2 airdrops come. (The first airdrop comes right after you sleep and wake up , and the last one comes tonight, what means that you can go to the safe zones marked on the map and sleep again because after that won't be more ''Survivors Quests'').
Stars = These are the locations that appeared more rescue missions on my walk through this achievement.
Map:
NOTE: When you find the rescue missions complete it. Then when appear your survival exp (or the lil saving block in the lower right corner of the screen)increasing quickly hold
after that to close the application! When you restart it, there'll be a higher chance that the same rescue at the same place you did before.
NOTE2: From my experience what I also did was close the application if I could not find anything cause going to sleep was to much of a hassle in my opinion.
Any questions feel free to comment.