Unlike the collectibles, the optional conversations must all be found in one play-through.

Just like in the main game, press Triangle at certain areas to engage in the optional conversations. They are all during the chapters when Ellie and Riley are together. There are only 13 optional conversations in Left Behind. – All optional conversations found in Left Behind. The difficulty related trophies will pop after the credits have finished and you’re back to the main menu. The enemies will all start running in every direction as they fight so be aware of their locations. Just make sure before you do it that you have a good hiding place. Letting the enemies kill each other will help you greatly. Whenever you get a chance to do this, do it. To do this, throw a brick or a bottle to make a noise. There are some parts of this DLC that enable you to lure infected to human enemies. You’ll also be able to pick up most of your shot arrows which will help with ammo. Ellie’s knife and the bow are very useful as those allow you to take out enemies quietly.

Only the chapters with Ellie alone looking for medicine will have combat.

Make sure you are searching for supplies in every area you come to. You’ll take greater damage, enemies take more damage, enemies senses are higher, the listen mode is disabled and supplies are very scarce. If you’ve played The Last of Us on Survivor before, you already know what to expect. See the trophy Don’t Go – Survivor for more details.

The last of us part 2 trophy guide