If you collect 10 Servo Skulls, you will unlock Lexicanum achievement or trophy and if you collect all the Servo Skulls, you will unlock Librarian of Macragge achievement or trophy. If you are up for it, this guide should be all that you need to retrieve all 48 Servo Skulls in the game.
Warhammer 40,000: Space Marine Servo Skulls
We have a brief text and detailed video showing the location of where you can find Servo Skulls, with each collectible in order of chapters and with quest references.
Servo Skull #1
Location. At the start of the chapter, before entering the building, destroy the ork barricade opposite of that building and you will find it.
Servo Skull #2
Location. At the start of the chapter after your conversation with Leandros and dealing with the ambush by gretchins, you will find on a patch to the right, by some sandbags.
Servo Skull #3
Location. You will find it in the second bunker in the trenches, just after you meet Lt Mira.
Servo Skull #4
Location. In No Man’s Land, look near the grenades in a small room after you enter the building from the courtyard.
Servo Skull #5
Location. During no Man’s Land, after exiting the building, look for it on the first bunker to the left.
Servo Skull #6
Location. Once you are inside the fortress, look to the right and destroy the barricade that is next to the ammo. Get inside the room and you will find the Servo Skull.
Servo Skull #7
Location. In the Armory, take the elevator on the lower floor and you will find the skull ahead of you by some ammo.
Servo Skull #8
Location. In the Train Station at the end of the first walkway, just before you head to the train, turn left to get this skull.
Servo Skull #9
Location. At the start of the chapter, after seeing the Crane and finishing the orks in lower area, look behind the crate to the right.
Servo Skull #10
Location. In Cargo Bay, after you take the elevator down, you will find it on the walkway towards the maufacotorum.
Servo Skull #11
Location. At the start of the chapter, when you are on your way up to the elevator, take a walkway left that is going down with some grenades and you will reach this skull.
Servo Skull #12
Location. At the start of the chapter, just before activating the bridge, head to the ramp to the left of the door.
Servo Skull #13
Location. You will find this skull in the sewers at the start of the chapter, after your second encounter with the works. You should find it in the left sewer entrance. It is opposite to the exit.
Servo Skull #14
Location. At the start of the chapter, before the elevator and after you drop down to the catwalks, look behind a barricade on the left and you should find this skull.
Servo Skull #15
Location. At the start of the chapter, before entering the street, drop down into some rubble, and look in the hallway behind you.
Servo Skull #16
Location. At the start of the chapter, after your encounter with Shoota Boyz and entering the building, look for it in a room to the right.
Servo Skull #17
Location. Go upstairs from where the previous skull and you should find it in a room on your left.
Servo Skull #18
Location. During Street Warfare, first underground tunnels, in an area to the right with ammo.
Servo Skull #19
Location. During Street Warfare before the ramp up, after the fight with Orks in the big room, to the left of the ramp.
Servo Skull #20
Location. During Jump pack, after you jump up to the first platform, follow the path to the right, and then jump up to next level to reach this skull.
Servo Skull #21
Location. During Jump pack, after your first encounter with Orks, head past the crashed Rok, and to the right of the stairs.
Servo Skull #22
Location. During Jump pack, after fight with the Wierdboy; head down the stairs to the right and you should find it by the grenades.
Servo Skull #23
Location. During Jump Pack, after exiting the area with the Weirdboy, before heading down the stairs, jump over some rubble straight ahead to reach it.
Servo Skull #24
Location. In the next area that is two level above you on your right after climbing up the small stairs.
Servo Skull #25
Location. In Kalkys Outskirts, take a left from the destroyed bridge, and you will find it at the end of the canyon.
Servo Skull #26
Location. In Kalkys Outskirts after the previous Servo Skull, look nearby *Where canyons converge is a crashed Valkyrie*.
Servo Skull #27
Location. After the previous skull, you will find it left of the ramp after the second pipe just before heading up the ramp.
Servo Skull #28
Location. At the start of the chapter, when you come across an intersection after destroying the pair of servo turrets, take a left instead of right.
Servo Skull #29
Location. During the Lab section, it is in the smaller lab with a turret. If you are out of ammo, you can destroy the turret for ammo.
Servo Skull #30
Location. Finish off the Shoota Boyz, place the power source at the center of the Security Room, and take a side walkway with the destroyed door. You will find the Servo Skull nearby.
Servo Skull #31
Location. At the start of the chapter, when you are to enter a pipe from the bridge. Go upstairs and turn left and you will find the servo skull at the end of the hallway, behind the barricade.
Servo Skull #32
Location. After retrieving the previous Servo Skull, follow the hallway in the opposite direction, there is a large room with ammo past the stairs behind another barricade that you will come across. You will find the Servo Skull inside this room.
Servo Skull #33
Location. After the big fight between Chaos and Orks, go upstairs and you will find it in the room to your right on the upper floor.
Servo Skull #34
Location. During Enemies Aplenty, re-unite with Lt. Mira, and look for it near the back wall by some ammo.
Servo Skull #35
Location. During Enemies Aplenty, take the elevator and head down the hallway till you reach another hallway to your right. To the right of that hallway is a small room and inside is Servo Skull.
Servo Skull #36
Location. During Bastion Primus, when you go back to the original hallway from the elevator, at the end of that hallway, it is down the catwalk by some weapons and a shrine with a Plasma Gun.
Servo Skull #37
Location. During Bastion Primus, after you break apart from your squad and Lt. Mira, you will find it in a trench near a weapon cache.
Servo Skull #38
Location. During Bastion Primus, you will find it before the fight with Warboss. It is under the bunker, behind some crates near the ammo cache and final door.
Servo Skull #39
Location. At the start of the chapter, you will find it before exiting the catwalks area, through the door on the left, just before the ramp.
Servo Skull #40
Location. During Free The Titan, you will find it in the left corner of the room after exiting the elevator.
Servo Skull #41
Location. During Free The Titan, when you break your squad; go up the ramp to the left of the elevator and you will find it in the side room.
Servo Skull #42
Location. You will find it in a small room to the left of the walkway where you encounter the Chaos Drone.
Servo Skull #43
Location. At the start of the chapter, exit the elevator and look right of the ammo and weapons to retrieve this Servo Skull.
Servo Skull #44
Location. In Traitor’s Arena, it is in a destroyed pipe to the right of where you fight Renegades, which is just before you head outdoors.
Servo Skull #45
Location. In Traitor’s Arena, after you fight with Bloodletter Daemons. It is near the weapons before you head up the stairs to the next area.
Servo Skull #46
Location. In Ascent, after you meet with Chaos Psyker, look for it in a hallway on the left.
Servo Skull #47
Location. In Vertigo, you will find it on a floating platform above the Chaos Space Marine just after you exit the hallway.
Servo Skull #48
Location. In Vertigo, after your encounter with Chaos Drone, look for it in a small room to the right.
You can also use this video guide that walks you through all the locations where you can find these Servo Skulls in Warhammer 40,000: Space Marine.
Good Luck Marine!