Semiconductors come in 4 different flavors: Bronze, Gold, Ruby and Platinum. They sell for 1k, 3k, 10k and 25k, respectively. They are well hidden, or found in power node rooms. You can almost always find one in a power node room. Additionally, Brutes will usually drop a Gold or Ruby. You'll also encounter a Necromorph that shoots multiple projectiles at you in some Zero-G areas. In order to kill these, you've gotta shoot their yellow bulb things. When you kill these, they'll usually drop a Ruby. Since it's Zero-G, it won't always be obvious where it is, but keep looking.
Just explore and you'll get this.
Here is an awesome video guide done by PowerPyx of each item in each chapter (a total of 25 Schematics). I also list the requirements below the video so make sure to read that and be prepared for what you need (for instance power nodes).
Chapter 1: Engineering Elite Suit (New game+ mode only)
Chapter 2: Power Node + Stasis Pack (1 node requirement for Power Node to open the door, no requirement for stasis pack)
Chapter 3: Pulse Rifle + Javelin Spears (no requirement for either)
Chapter 4: Security Suit (no requirement)
Chapter 5: Ripper + Medium Med Pack + Line Racks + Detonator (no requirement for any)
Chapter 6: Seeker Rifle + Pulse Rounds + Flamethrower + Elite Vintage Suit (New game+ mode only for Vintage Suit)
Chapter 7: Ripper Blades + Force Gun + Contact Beam (Requires 1 Power node for the Contact Beam)
Chapter 8: Vintage Suit + Detonator Mines + Large Med Pack (Vintage Suit requires 1 power Node)
Chapter 9: Flame Fuel + Seeker Shells (no requirement)
Chapter 10: Force Energy (no requirement)
Chapter 11: Contact Energy + Advanced Suit (Requires 1 power node to get the Advanced Suit)
I made a short list myself. This list does not count the audio logs you'll get automatically--the "Cutscenes," if you will. It also does not count any logs found in Conduit rooms, which you'll only have access to if you beat Dead Space: Ignition. Finally, this is not a complete listing, but there's about 10 more listed here than you need to get the achievement. I got the achievement around chapter 10.
Audio log 1: You'll come to a room that's completely black, and as you walk in you'll get a tutorial tip telling you to hold LT to use your flashlight. Proceed through this room and through the door at the other side, and you'll see the audio log to your right.
Text log 1: You'll go through a door into a room, and you'll see a dead marine with a glowing arm band communicator thingamajig. Head through the other door in this room, and then make a right, then a left, and then another left. The Text Log will be on the desk between the two gurneys.
Text log 2: You'll eventually come to an area where a man will slip underneath a closing door. He calls himself "Patient 5." Opposite this door, you'll see a circular reception desk, with two small doors to the left and right of it. Head through the left door, and look to your immediate right.
Text Log 3: Shortly after the last text log, you'll come to a room with many blue lights, and a red console that you can hack to your left. To the right of this console on the floor lies the log.
Text log 4: After going up an elevator, you'll see some balloons directly ahead of you. Head over to them and make a right. On the floor near to the desk you'll see the log.
Audio log 2: As soon as the chapter begins, it's on the floor in front of you.
Text log 5: Found in the first power node door near the first save point. It will cost you a power node to open the door.
Text log 6: Once you find yourself in an "outdoor" area, follow the objective locator through a door and to an elevator. Before going into the elevator, turn around and head into the hallway in front of you to find the log.
Text log 7: Once you get to the room with Lightspeed Boy, make a left to find the "Bold Stylings" shop. You'll see the text log on the floor.
Text log 8: Shortly after the last log, follow your objective locator to a building with a yellow Marker sign in it, and two TVs to the left and right of the entrance. Head in and look to your right to find the log.
Text log 9: Shortly after the last log, head down the elevator, step out, look left and you'll see it on a desk.
Text log 10: As soon as the chapter begins, head through the door on the left, then head through the door to your right and you'll find the text log inside this small room.
Text log 11: Shortly after the last log, head all the way up the stairs and into the Reading Room. The text log will be on a desk right in front of you.
Audio log: 3: Head back out to where the chapter began, and go through the door on the right, then the door to the left. In this small room you'll find the audio log.
Text log 12: Once you get to the indoctrination room, your objective locator will point you to a door with a Stasis unit next to it. Head through the only door that you're able to right now, and on the left side of this room you'll find a dead lady in a chair with the text log on the ground near her.
Text log 12: Towards the beginning of the level, you'll be moving through a giant refrigerator (Or something). As you make your way through the refrigerator, you'll go through a door and you'll see yet another wall of frozen pods straight ahead behind a waist-high wall. The log is sitting on the right side of this waist-high wall.
Text log 13: Once you exit the refrigerator, this log will be sitting on the Gravity Controls terminal straight ahead of you.
Audio log 4: You'll eventually come to a large area that is partially engulfed in flames, and has no gravity. Float up to the second floor of this large area, and near a locked door to the left you will find the floating log. It's possible that this log moves around, and may not be in the spot I described.
Text log 14: As you progress through the elementary school, you'll come to a room with storage boxes on the wall and a save station. The log is sitting on the desk in this room.
Text log 15: After you exit the large stage area of the elementary school, follow your objective locator until you're able to make a right (Your locator will tell you to go straight ahead). Make a right, open the door and you'll see the text log on a small desk.
Text log 16: Once you've gone up the elevator to the solar array, follw the objective locator through a door with a Cyst above it. Head to the right of the hologram and into another room. Look left to find the text log on a desk.
Text log 18: Follow your objective into a room where you'll be attacked by Crawlers. Head into the door opposite the one you entered this room from. To your right you'll see lockers you can open. The one on the right contains the log.
Text log 19: This is found in through a power node door directly to the left of a save station.
Audio log 5: Through the first door you enter, on the right side of the room near some flames.
Audio log 6: Continue through the level, past a power node door and you'll come to a room where you'll be attacked by two Necromorphs, once of which has a thighroid problem. On the wall there will be a sign talkin' about Stasis, and to the left of this sign is the log.
Audio log 7: Once you get to a room with a store in it, you'll find this log near the door you entered from.
Audio log 8: You'll come to a door that reads "Fuel Pressurization Tower Mid level." Head through this door, and clear out the Detonator mines on the wall at the first right turn. Head up the newly cleared walkway, turn right again, and use Kinesis on the crates to move them out of the way and reveal the log.
Audio log 9: After you've fixed the tram and gotten to the next save point, head through the door, and to the left of two Cysts you'll see the audio log sitting next to a dead body.
Text log 20: Follow your objective locator until you get to the first save station. Behind you, you'll see a door with some objects in front of it. Kinesis the objects out the way, open the door and the log will be straight ahead on a... thing.
Audio log 10: Facing the last log, head through the door to the right, then make a left. The log will be sitting on the ground near a light.
Audio log 11: Once you get to save station #2, follow your objective locator through two doors. Your locators wants you now to go right, instead follow the path all the way to the left. The log will be sitting in front of a locked elevator door.
Audio log 12: On the floor of an elevator you are required to go into.
Audio log 13: Follow your objective locator into a door that reads "Elevator to Exploration Mine." On the other side of this area you'll see the audio log. Use Kinesis on it, or call the cargo lift, walk over to it and pick it up. (Found none in 12. As I said, not a complete listing)
(Found none in 12. As I said, not a complete listing)
Audio log 14: Shortly after you have to use the dead body to trick the scanners, you'll see this log directly in your path.
Audio log 15: Follow your objective locator through a room with a large blue chamber in the middle, and over to the door. Before going through the door, turn around look to your right to find the log on the ground near a desk.
Audio log 16: Once you get into the room with the Stalkers, you'll find this log near the generator that's hanging the air. It's on the ground near two wall storage boxes.
Audio log 17: This one is right in your path. Follow your objective locator into a room with a white pyramid looking thing in the middle of it. The log is sitting on the ground near said pyramid thing.
Audio log 18: Once you get to the area where you fight the Brute, this will be along the wall to the right of the door you entered from.
Text log 21: This is on the desk to the right of the store.
Audio log 19: Turn around from the last lag, and use Kinesis on the helmet sitting on the desk to reveal this log.
Audio log 20: After you hack open the door, your objective locator will lead you to the left. Follow it until it leads you to the left again. Before going left, look straight ahead to find the log sitting near a dead body.
Audio log 21: After going through a door, you'll see this log sitting on the ground near a console with a dead body on top of it directly ahead of you.
Text log 22: Once you get to a cargo lift, this log will be next to it. Hard to miss.
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