Resistance 3
59 Achievements
20-25h
Silent Partner
Damage the same enemy in Cooperative Mode for 100 kills
20.8%
How to unlock the Silent Partner achievement in Resistance 3 - Definitive Guide
Both of you should equip the Cryogun and use the secondary fire to hit the enemies. As you progress through the area, make sure you're generally aiming in the same areas so you can hit the same enemies. Once you get near the end of the checkpoint, just let the remaining enemies kill you to restart the checkpoint and respawn the enemies. It will put you right outside of the arena area and all of the enemies will respawn, but your trophy progress won't be erased from dying.
This trophy must be done in either online or local co-op. While the description of this trophy may be a bit confusing, all this means is that both you and your partner must damage the same enemy before they die. It doesn't matter who deals the final blow, as long as both of you got a shot off on the enemy. Do this 100 times, and the trophy is yours. Like the other trophies, this can be farmed at checkpoints, or simply gotten by playing through the game. If done properly, this trophy should only take about 3 or 4 chapters worth of killing to unlock. Please refer to the trophy boosting thread if you need to find a partner. (https://www.playstationtrophies.org/forum/resistance-3/123303-co-op-partner-thread.html).
A very easy way to farm this is to load up Graterford, PA: The Pit, and work your way towards the Grim chamber. Once there, player 1 should stay up on the ledge, while player 2 goes down and spawns as many Grims and Leapers as possible. Once several enemies are on player 2, back him into a corner and spray with the cryogun's secondary fire. Now player 1 should use any weapon of their choice to shatter the frozen enemies, thus killing them. Now simply let player 2 die and repeat the process. It should only take a matter of minutes to get the trophy here.
the second joy remains on the ledge, and the first jumps off and lures a crowd of beasts to the ledge and freezes them, the second player, using an alt shot from the Cryogun, breaks them into fragments (in this version, the corpses go to the count of 1 player)
for each game you will get at least 20 kills and after 10 minutes the trophy will open