There are 48 Servo Skulls to collect in Warhammer 40,000: Space Marine for the PC, PS3, and Xbox 360.
Here is the complete list of Servo Skulls, and where to find them.
Chapter 2
1. At the beginning of the chapter, before entering the building, destroy the barricade opposite of the building to find it
2. At the beginning of the chapter, after dealing with the ambush by the Gretchins, it’s on the right near some sandbags
3. In Trenches, in the second bunker after you meet Lt. Mira
4. In No Man’s Land, it’s in a small room after you enter the building near some grenades
5. In No Man’s Land, look for it on the first bunker on the left after you exit the building
Chapter 3
6. At the beginning of the chapter inside of the fortress, destroy the barricade on the right and you’ll find it inside of the room
7. In the Armory, take the elevator on the lower floor and you’ll find it near some ammo
Chapter 4
8. In the Train Station, you’ll find it on the left at the end of the first walkway before the train
Chapter 5
9. At the beginning of the chapter, after seeing the Crane and fighting the Orks, you’ll find it behind a crate on the right
10. In Cargo Bay, you’ll find it on the walkway towards the manufactorum after you take the elevator down
Chapter 6
11. At the beginning of the chapter, when you are on your way to the elevator, look for a walkway leading down to find it near some grenades
12. At the beginning of the chapter, before activating the bridge, you’ll find it on the ramp to the left of the door
Chapter 7
13. At the beginning of the chapter, in the sewers, after you encounter the Works for the second time, you’ll find it in the left sewer entrance oppositve of the exit
14. At the beginning of the chapter, before the elevator and after you drop down to the catwalks, you’ll find it behind a barricade on the left
Chapter 8
15. At the beginning of the chapter, drop down into some rubble before entering the street and look in the hallway behind you to find it
16. At the beginning of the chapter, after encountering the Shoota Boyz and entering the building, you’ll find it in a room on the right
17. Upstairs from the previous skull, in a room on your left
18. In Street Warfare, in the first underground tunnels, you’ll find it in an area on the right near some ammo
19. In Street Warfare, before the ramp up and after the fight with the Orks in the large room, you’ll find it left of the ramp
20. In Jump Pack, after you jump up to the first platform, follow the path to the right, then jump up to next level
21. In Jump Pack, after your first encounter with Orks, go past the crashed Rok, and look to the right of the stairs
22. In Jump Pack, after the fight with the Wierdboy, head down the stairs to the right and you’ll find it near the grenades
23. In Jump Pack, after exiting the area with the Weirdboy, and before heading down the stairs, you’ll find it when you jump over some rubble
24. In Jump Pack, in the next area two levels above you on your right, climb up the small stairs to find it
Chapter 9
25. In Kalkys Outskirts, take a left from the destroyed bridge and you’ll find it at the end of the canyon
26. In Kalkys Outskirts, where the canyons come together, look for it near the crashed Valkyrie
27. In Kalkys Outskirts, before heading up the ramp after the second pipe, you’ll find it on the left of the ramp
Chapter 10
28. At the beginning of the chapter, go left instead of right after destroying the pair of Servo turrets
29. In The Labs, you’ll find it in the smaller lab with the Turret
30. In the Security Room, before inserting the power source at the center of the room, head towards the side walkway with the destroyed door after clearing the defeating the Shoota Boyz
Chapter 12
31. At the beginning of the chapter, after going through the pipe from the bridge, go upstairs and left to find it at the end of a hallway behind a barricade
32. At the beginning of the chapter, after getting the previous Skull, follow the hallway in the opposite direction and look for it in a large room past the stairs and behind another barricade
33. At the beginning of the chapter, after the battle between Chaos and Orks, you’ll find it upstairs in a room on the right
34. In Enemies Aplenty, after you reunite with Lt. Mira, look for it near the back wall
35. In Enemies Aplenty, after the elevator, go down the hallway until you reach another hallway to your right, and you’ll find it in a small room on the right of that hallway
36. In Bastion Primus, when you go back to the original hallway from the elevator, at the end of that hallway, you’ll find it down the catwalk by some weapons and a shrine with a Plasma Gun
37. In Bastion Primus, after you break apart from your squad and Lt. Mira, you’ll find it in a trench near a weapons cache
38. In Bastion Primus, before the fight with the Warboss, under the bunker and behind some crates near the ammo cache and the final door
Chapter 13
39. At the beginning of the chapter, you’ll find it before exiting the catwalks area, through the door on the left before the ramp
40. In Free The Titan, you’ll find it in the left corner of the room after exiting the elevator
41. In Free The Titan, when you break apart from your squad, you’ll find it in a side room up the ramp to the left of the elevator
42. In Free The Titan, it’s in a small room to the left of the walkway where you encounter the Chaos Drone
Chapter 15
43. At the beginning of the chapter, exit the elevator and you’ll find it to the right of the ammo and weapons there
44. In Traitor’s Arena, before you go outdoors, in a destroyed pipe to the right of where you fight Renegades
45. In Traitor’s Arena, after you fight with Bloodletter Daemons, near the weapons before you go up the stairs
46. In Ascent, after you meet with Chaos Psyker, in a hallway on the left
47. In Vertigo, on a floating platform above the Chaos Space Marine after exiting the hallway
48. In Vertigo, after your encounter with Chaos Drone, in a small room on the right
