This is a guide to uncovering all 50 of those sneaky little green watchers that are spread throughout the story. After destroying a watcher, you MUST progress far enough to a checkpoint to have the game save your progress or it won't be recorded.
Scene 1 - The Fallen World
#1 - After a scene where a building collapses you enter an alley and its high up on the left.
#2 - After the story scene elaborating more about the tower, turn right, above the debris
#3 - Across the bridge where the enemies are on the far side after #2
#4 – In the underground area when you encounter enemies, look to the fenced area on the left
#5 - As you come out from the underground tunnel into an open area with enemies, immediately turn left
#6 - After the previous area, you'll come to a narrow alley, walk forwards abit and look upwards to the left, it's slightly hidden. This is just before you jump over an obstacle that has an ammo box behind it. Your allies will be chatting on coms and the door to the next area collapses.
#7 - After coming out of the alley, you reach a wide open area with lots of Brutes and soldiers, the Watcher is on top of the bridge to the left.
Scene 2 - The Root of the Tower
#8 – From where you start, look to the right for a grey pillar. The watcher is behind it.
#9 - In the second area with the beam-shooting things, theres a watcher high up to the right of the beam-thing on the that side.
Scene 3 - Inflorescence
#10 - This one is located high up on the right, above the golden bar thing.
#11 – In the corridor with the snipers, after you’ve killed them, there will be a cutscene showing a Security Crystal Core. To the right of the stairs you’ll find a path that leads to an area at the back and #11.
#12 - In the room where you encounter the girl that looks like Nyx, goto the highest floor via the stairs on the right and its above from where you entered the room.
#13 – In the room with the turret, there’s a passage that goes underneath the turret. The Watcher is in there.
Scene 4 – Lumenosynthetic Reactor 1
#14 - In the first room you’re in go up the small steps on the right then immediately turn around. The watcher is near the top of second pillar on your right.
#15 - After destroying the reactor, you get to a part where you are asked to dash across the bridge (the most annoying part of the game). The Watcher is above Filena on the other side of the bridge, shoot it before you cross because the chapter ends once you’ve done so (after dying a lot and being frustrated with the controls I bet).
Scene 5 – Abdomen
#16 – After learning about combo attacks, there’s a big hole in the wall on the right, the Watcher is in there.
#17 – In the room where the diablosis transforms some of the guards, stand in the middle facing the twin stairs with a thick pillar in the middle. There are several thinner pillars surrounding you, look up and to the right and you’ll spot the watcher near one of the pillars.
Scene 6 – Trachea
#18 – At the beginning, you will pass two shooting turrets while riding the Granula. Right before the third turret, there’s a straight pipe on the right that bends upwards then downwards again, the Watcher is underneath the bend.
#19 - When you encounter the 2nd group of soldiers while flying upside down, pay attention to the right corner of the platform their standing on and you'll see it.
#20 – Before you encounter the third group of enemies look to the wall on the far left side. You should see a cut out section and a big pipe. The watcher is on the bottom left corner of this section. Use a rocket launcher if you’re having problems.
#21 – Very tricky one, when you’re done blasting all the enemies in the big open area, you will then enter another passage. You will need to shoot a colored glass pane to proceed and right after that you will turn roght and see the green watcher in your sights. Its gonna take several tries to nail it down but you can pause and retry as much as you need.
#22 – After the 3rd checkpoint where you get off the Granula and eliminate enemies on a falling section, before jumping back onto another Granula, turn towards where you started from and the Watcher is underneath.
Scene 7 – Thorax
#23 – You start in a tall room and as you move into a cave, it’s immediately on your left.
#24 – This one is in an alcove to the right when you encounter a big giant Gillskin (Chariot).
Scene 8 – Alveolar Alembic
#25 - Starting in the second room with all the plants, go to the far left side and look along the left wall/window where you can see the first room you were in. You should be able to see the watcher around this spot.
#25 another way to get his one.
In the first room, go up the stairs and go left. fight ur way to the door/window thing as mentioned by everyone else. (make sure its not the one right at the top of the stairs, its the one way to the left) now look through it at Syd's eye level. NOT up at the ceiling. its right in Syd's face on the other side, just shimmy left/right until u see it. thats how i found it anyway.... but for some reason when i went to the other side (in 2nd room looking back at the 1st room) it was never there? I dont get it at all but it could explain why u cant find it... hope this helps.
#26 – In the area where you need to destroy 3 Security Cores, keep taking the left path and after you pass the 3rd green crystal on your left, look on your left wall just before you go up a small slope.
#27 – In the same area as #26, look behind the trees in the far left corner behind the 3rd Security Core.
#28 – Very hard to spot and easy to miss. This is in the area with the large tree, refer to this photo and look up at the gap where the arrow is pointing. Look for something hovering up and down very slightly. Xbox360Achievements.org
Scene 9 – Lumenosynthetic Reacot 2
#29 – Starting area, go up the left stairs, and head into the leftmost passage, its straight ahead.
#30 – After clearing the previous area and going past the exit door, turn right immediately.