Your Forensic M.E. Protocol 100 Percent Achievement Completion Guide

This forensic me protocol 100 percent achievement completion guide provides the most direct path to unlocking all trophies and earning the coveted Platinum. The core requirement is simpler than it sounds: finish all five cases with at least a B-rank and secure a single S-rank on any one case of your choosing. There are no difficulty-related achievements, so you can play on whatever setting you prefer. This guide will walk you through the overall strategy, the ranking system, a case-by-case B-rank path, and the easiest method for that crucial S-rank.

Our strategy is built on a single, focused playthrough. We'll prioritize the missable evidence in each case to guarantee a B-rank floor, then provide a deep dive into Case 3, "The Marionette's Murmur," which is the most predictable and straightforward case for achieving a perfect S-rank. Following this roadmap ensures you won't need a second playthrough for cleanup.

01

The Roadmap: One Perfect Playthroughtag

Forget worrying about every single piece of evidence on your first run. The path to 100% completion is about efficiency, not perfectionism across the board. The game's achievement list is surprisingly lenient, only requiring competence (B-rank) in all investigations and mastery (S-rank) in just one.

Here is the high-level plan:

1. Play Through Cases 1-5 Sequentially: Focus on finding the key evidence listed in our breakdown below. This will be enough to lock in your B-rank for each. Don't stress about finding every optional file or scanning every single object if you're not aiming for an S-rank on that particular case.
2. Target Case 3 for Your S-Rank: When you reach "The Marionette's Murmur," follow our S-rank guide meticulously. This case has the fewest variables and the most contained crime scene, making it ideal for a perfect run.
3. Collect All Memory Fragments: There are 25 Memory Fragments scattered throughout the five cases (5 per case). These are the game's only major collectible, tied to the "A Life in Pieces" achievement. We'll call out their locations in the case-by-case guide.
4. Perform Miscellaneous Actions: A few achievements, like "Data Ghost" and "Overclocked," require specific one-off actions. These can be easily mopped up during their respective cases.

By following this structure, you'll unlock the story-related achievements naturally, secure your case ranks, and grab all collectibles without needing to backtrack or start a new game.

02

How the M.E. Protocol Ranking System Workstag

Your rank at the end of each case—S, A, B, C, or D—is determined by a score calculated from three primary factors. Understanding this system is crucial for knowing where you can afford to make mistakes.

• Evidence Acquired (60% of Score): This is the most significant factor. Each case has a set number of "Critical" evidence pieces that are mandatory for solving it, and several "Supporting" pieces that add context. A B-rank generally requires all Critical evidence and about half of the Supporting evidence.
• Deduction Accuracy (30% of Score): At the end of a case, you must link evidence to form deductions and answer key questions (e.g., "What was the murder weapon?"). Each correct answer contributes to this score. Incorrect answers will penalize you.
• Contamination Penalty (-10% of Score): This is a penalty applied for errors during the investigation. This includes things like presenting the wrong evidence to a witness, failing a hacking minigame more than twice, or requesting a hint from your partner, Detective Harding. To get an S-rank, you must have zero contamination.

Essentially, to get a B-rank, you just need to find the main clues and get the big questions right. For an S-rank, you must be flawless: find everything, make no mistakes in your logic, and conduct a perfect investigation.

03

Case-by-Case Guide to a B-Ranktag

This section is your B-rank bible. For each case, we'll list the absolute must-find Critical Evidence and the locations of the five hidden Memory Fragments. Finding these items and making the obvious deductions at the end will guarantee you at least a B.

Case 1: The Alchemist's Apartmenttag

This introductory case is straightforward. The goal is to determine the cause of death of a reclusive chemist.

• Critical Evidence:
  • Modified Nebulizer (on the victim's desk).
  • Security Footage (access via the laptop; password is on a sticky note under the keyboard).
  • Toxicology Report (emailed to you after analyzing the victim's blood sample).
  • Threatening Letter (in the kitchen trash can).
• Memory Fragments: 5 total. The most commonly missed one is inside the hollowed-out book on the bedroom bookshelf.

Case 2: Echoes in the Server Farmtag

Here you investigate an electrocution at a data center. The environment is larger, so be methodical.

• Critical Evidence:
  • Sabotaged Power Conduit (in the maintenance tunnel below the server room).
  • Deleted Emails (must run a recovery program on the main terminal; takes two minutes).
  • Overridden Access Logs (on the security chief's computer).
  • Non-conductive Gloves (discarded behind a server rack in the back corner).
• Memory Fragments: 5 total. Check behind the loose wall panel in the breakroom for a tricky one.

Case 3: The Marionette's Murmurtag

This is our S-rank target, but for a B-rank, you only need the basics. The victim is a puppeteer found in his workshop.

• Critical Evidence:
  • Cause of Death (examine the ligature marks on the victim's neck).
  • Custom-Made Marionette Wire (found on a workbench, distinct from the other wires).
  • Hidden Financial Records (on a USB drive inside a dissected puppet).
  • Workshop Schematics (on the wall, revealing a hidden room).
• Memory Fragments: 5 total. One is hidden inside the head of the large marionette on the stage.

Case 4: Redlight Requiemtag

A musician is found dead in an underground club. This case has multiple witnesses to interview.

• Critical Evidence:
  • Audio Recording of the Argument (on the soundboard in the control booth).
  • Swapped-out Guitar Cable (in the dumpster in the alley).
  • Residue on the Victim's Glass (use your Bio-Resonance Scanner on the glass at the bar).
  • Witness Testimony from the Bartender (you must press him about the victim's argument).
• Memory Fragments: 5 total. Look for one taped under the main stage's front edge.

Case 5: Terminal Velocitytag

The final case takes place in a high-tech corporate office. The investigation is multi-layered and involves corporate espionage.

• Critical Evidence:
  • Fragmented Project Data (requires assembling three data keys from three different executive laptops).
  • Blackmail Dossier (in a locked safe in the CEO's office; the code is the company's founding year, found on a plaque in the lobby).
  • Deleted Elevator Logs (recover from the building's central security hub).
  • Prototype Neuro-headset (in the R&D lab, shows signs of being tampered with).
• Memory Fragments: 5 total. The final fragment is in the CEO's private elevator, accessible only after you've presented your initial findings.

04

How to Secure Your S-Rank on Case 3tag

"The Marionette's Murmur" is the perfect case for an S-rank because the crime scene is a single, self-contained room and there are no live witnesses to misread. Success here is purely about meticulous evidence gathering and flawless deduction. To get the S-rank, you must find all 15 pieces of evidence (Critical and Supporting), collect all 5 Memory Fragments, and make zero mistakes.

S-Rank Evidence Checklist: The Marionette's Murmurtag

You must find everything below and avoid any contamination penalties.

1. Ligature Marks (Critical): On the victim's neck.
2. Custom Marionette Wire (Critical): On the main workbench.
3. Financial Records USB (Critical): Inside the chest cavity of the main puppet on the work table.
4. Workshop Schematics (Critical): Blueprints on the wall.
5. Hidden Room: Interact with the back wall indicated on the schematics.
6. Scuff Marks: On the floor beneath the window.
7. Muddy Footprint: Just inside the window. Analyze it to reveal it doesn't match the victim's shoes.
8. Overdue Bills: On a small desk in the corner.
9. Half-Finished Marionette: Evidence of a new, expensive project.
10. Voicemail from a Rival: On the workshop's phone.
11. Wood Shavings: Under the victim's fingernails.
12. Discarded Puppet Head: In the trash can, showing signs of a struggle.
13. List of Creditors: Found in the hidden room.
14. Packed Suitcase: Also in the hidden room.
15. Train Ticket: Inside the suitcase, dated for the day after the murder.

The Final Deductiontag

Once you have all 15 pieces of evidence, you will be prompted to solve the case. The correct sequence of deductions for the S-Rank is:

• Motive: Financial Ruin (link Overdue Bills and List of Creditors).
• Murder Weapon: Custom Marionette Wire (link Ligature Marks and the Custom Wire itself).
• Suspect: The Rival Puppeteer (link the Voicemail and the Train Ticket, which was for his city).
• How it Happened: The killer entered through the window (Muddy Footprint, Scuff Marks), a struggle ensued (Discarded Puppet Head), and the victim was strangled from behind.

Select these options with zero errors, and the S-rank is yours.

05

Mop-Up Duty: Miscellaneous Achievementstag

There are a handful of trophies not tied directly to case performance. Here are the most commonly missed ones.

• Data Ghost: In Case 2, "Echoes in the Server Farm," there is a decommissioned server rack in the storage room. Find a note on a nearby desk with the login ADMIN and password Sequence7. Access this terminal to unlock the achievement.
• A Life in Pieces: This unlocks automatically when you find the 25th and final Memory Fragment in Case 5.
• Overclocked: During any Bio-Resonance Scanner puzzle, complete it with more than 75% of the time remaining. The first puzzle in Case 1 is the easiest place to do this.
• Fully Invested: Listen to all of Detective Harding's optional dialogue prompts during a single case. Just exhaust his conversation options whenever he has a speech bubble icon.

06

Frequently Asked Questionstag

Can I replay cases to improve my rank? Yes, after completing a case, you can replay it from the main menu's "Case Select" screen. Your highest achieved rank is the one that counts towards the achievements.

What is the easiest case for the S-Rank? Case 3, "The Marionette's Murmur," is widely considered the easiest. The crime scene is small, there are no interviews, and the evidence trail is very logical and contained. Case 1 is also a candidate, but has slightly more ambiguous supporting evidence.

Do I need to find all the evidence for a B-Rank? No. A B-rank only requires all Critical Evidence and about 50% of the Supporting Evidence. As long as you follow the main story beats of the investigation and don't make major errors in the final deduction, you will almost always secure at least a B.

Are any achievements missable? Technically, no. Because you can replay any case, you can always go back for collectibles (Memory Fragments) or case ranks you missed. However, following this guide will get you everything in a single, linear playthrough.

The Final Analysistag

Achieving 100% in FORENSIC - M.E. Protocol is less about being a perfect detective and more about being a smart one. By focusing your efforts on a guaranteed B-rank for most cases and executing a flawless run on the highly predictable third case, you can unlock everything the game has to offer efficiently. The key is to understand the scoring system and not get bogged down in finding every single non-essential clue when it isn't required. Follow this guide, and the Platinum trophy is well within your grasp.