In File R-02 you take control of a "Tripod" aka a Dwarf Gekko As you move around the next area you see enemies that you can easily knock out. you can either knock out these enemies or avoid them.
To get this trophy you're going to knock them out. There's almost no challenge to knocking them all out as they don't aggro on you, they don't attempt to harm you unless they see you taking out another guard.
You can either wait and study patterns to make sure they don't see each other or follow this advice.
As you take control of the dwarf gekko immediately attack the enemy in front of you (from behind, always from behind), then turn around the right corner and knock out the next guard as fast as possible, he'll already be facing away. Then run around the next corner, there will be stairs up, and a guard a little further, go knock out that guard quickly. There will be a guard at the top of the stairs and he starts walking down it, run up the stairs, behind him and knock that guard out as well, finally following the upper balcony around and find the fifth guard, knocking him out will unlock the trophy.