Found all Ranger stashes in Dead City
Metro 2033 Redux RANGER – Achievement / Trophy Guide
Make sure to make some ammo space by shooting your guns every now and then. If you take loot it can happen that you don’t pick up everything because an ammo type is full.
It seems this is not necessary as long as you press x and the red ammo sign comes up. Let me know what worked for you and i’ll add it here.
There are several hideouts that definitely count but since it’s not really known what exactly a “Stash” is, your best bet is to pick up everything throughout Dead City. You will come across a lot of dead bodies, random spread out loot, crates, boxes and some safes.