To unlock the Survivor trophy in The Walking Dead: The Final Season Episode 4, you will need to collect all four of the collectables available in the episode.
The first two collectables can be found when you are in the cave and have to find a way to cross the river.Collectable 1:
Walk past AJ to find a toy
on the ground between AJ and a walker that is laying in the river.Collectable 2:
Walk past Tenn and stay close to the wall that is leading towards a huge log that is blocking the path. You will find the crystal
on the ground shortly before you reach the log.Collectable 3:
Depending on what options you chose at the end of Episode 3, there are two possible ways to get James' Mask
When you are playing as AJ in the fishing hut, you will find the Skull
next to the broken cooker.