achievement-walkthrough

id: "achievement-walkthrough" slug: "achievement-walkthrough" order: 99 title: "Achievement Walkthrough — Step-by-Step Path to 100 Percent" description: "Complete achievement walkthrough for The Incident at Galley House. Step-by-step path to earning all 15 achievements." keywords: ["achievement walkthrough, 100 percent, all achievements, completionist walkthrough"] category: "walkthrough" date: "2026-07-15" lastModified: "2026-07-16" image: "/images/video-O_p_XlhKONY.webp" video: "O_p_XlhKONY"

Achievement Walkthrough — Step-by-Step Path to 100 Percent

The Incident at Galley House features 15 achievements, including 5 hidden ones that do not reveal their unlock conditions until you earn them. This achievement walkthrough provides a step-by-step path to 100% completion, organized for maximum efficiency so you can minimize backtracking and earn every achievement in a single playthrough. Whether you are a completionist aiming for a perfect Steam profile or simply want to experience everything the game has to offer, this guide covers every achievement in detail.

Overview of All 15 Achievements

The achievements in The Incident at Galley House span four categories: story progression, scene discovery, deduction quality, and hidden/meta achievements. Understanding these categories helps you plan your playthrough for maximum efficiency.

Phase 1 — Story and Discovery Achievements

First Memory

This achievement unlocks automatically when you enter your first valid code into the memory machine. You will earn it within the first few minutes of gameplay. Simply enter code 01-EN-1-11 to view the arrival scene at Galley House's Entrance. This is unmissable through normal play.

Machine Supervisor

The first power restoration occurs early in the investigation after you have unlocked several scenes. When the machine goes dark, examine the physical components around the machine. The solution involves interacting with the machine's controls in a specific order — follow the visual cues provided by the lights and switches. This achievement is story-required and cannot be missed, though the exact restoration sequence may take a few minutes to figure out if you are not paying close attention to the environmental clues.

Technical Engineer

The second power restoration requires more exploration than the first. You must search the D&M facility for additional power resources rather than just manipulating the machine directly. Pay attention to dialogue in present-day scenes — characters discuss the machine's quirks and power requirements, providing the hints you need. The key is to explore your surroundings thoroughly rather than staying focused only on the machine interface. See the power restoration guide for detailed step-by-step instructions for all three restorations.

The Whole Truth

This achievement unlocks when you complete the meta-plot deduction, which requires solving the connection between the past and present timelines. You need information from both Part 1 and Part 2 scenes to make this deduction correctly. The meta-plot is the deepest mystery in the game, and solving it means you have understood the true relationship between D&M, the memory machine, and the events at Galley House in 1936. Visit the deduction guide for strategies on piecing together the meta-plot.

Phase 2 — Scene Discovery Achievements

Full House — All 16 Locations

The Full House achievement requires you to discover and label all 16 location codes in Galley House. This is one of the most time-consuming achievements because some locations are deliberately hidden.

Ground floor locations (9): EN (Entrance), LI (Living Room), QU (Quail Lane), ST (Study), KI (Kitchen), DI (Dining Room), BI (Billiard Room), CH (Chapel), WI (Wintercote). Most ground-floor rooms are available from the start — you discover them by entering codes that reference them.

Upper floor locations (6): ED (Eddie's Room), TO (Tony's Room), MA (Martha's Room), VI (Victoria's Room), HE (Helen's Room), OS (Oswald's Room). These bedrooms are discovered through story progression — entering codes that reference these rooms adds them to your location database.

Top floor location (1): AT (Attic). The attic is where the body is discovered and is critical to the story. It is typically found through mid-game codes.

The two hardest locations to discover are Wintercote (WI) and the Attic (AT). Wintercote is referenced in specific dialogue but is not immediately obvious as a location code. If you are missing WI, search for scenes that mention exterior or garden areas using the keyword search tool. For the complete list of location codes, visit the location guide.

Spectronoeticist — View Every Scene

This is the hardest achievement in the game. It requires viewing every single memory scene, including all hidden scenes, all Part 2 present-day scenes, and all special codes. The most commonly missed scenes are:

• Scene 00 (enter code 00-EN-0) — a mysterious prologue
• TYPE-HELP meta scene — enter the code TYPE-HELP
• Hallucination scene — requires a specific hidden code
• Person Plus 64 scene — involves a character outside the normal 1-11 range
• Person K scene — involves a special character number

To systematically track your progress, cross-reference your discovered scenes with the complete scene codes list. Keep a personal log of which codes you have tried and which were valid. The keyword search tool is essential for finding references to scenes you may have missed.

Partial Recall and Total Recall

These two achievements are milestones on the path to Spectronoeticist. Partial Recall unlocks when you have viewed 25% of all scenes, and Total Recall at 75%. You will earn Partial Recall naturally during the early investigation, but Total Recall requires deliberate effort to find hidden scenes and less obvious codes.

Phase 3 — Hidden Achievement Walkthrough

TYPE HELP

Enter the code TYPE-HELP into the memory machine at any time. This is a meta-code that unlocks a special scene referencing the original Type Help browser game by William Rous. It also awards the TYPE HELP achievement. You can enter this code at any point during your investigation — it does not require any prerequisites. This is one of the easiest achievements in the game, yet many players miss it because the code does not follow the standard Timestamp-Location-Characters format.

Hallucination

The Hallucination achievement requires discovering a specific hidden scene tied to the supernatural elements of the Chapel. The code for this scene is not intuitive and cannot be found through normal investigation alone. To unlock it, pay close attention to dialogue in Chapel scenes (codes using the CH location) and look for references to unusual states of consciousness or perception. The progressive hint system can point you toward this scene if you request hints about supernatural phenomena. See the hidden codes guide for additional context.

Plus 64

This hidden achievement involves discovering a scene with a character numbered beyond the normal 1-11 range of past characters. Person Plus 64 appears in a specific scene that requires an unconventional character number in the code. Look for clues in present-day scenes where D&M employees discuss the machine's capabilities and the range of accessible memory echoes. The keyword search tool with terms like "beyond" or "outside" may reveal references to this character.

Plus K

Person K is a special character who exists outside the normal numbering system. Finding Person K requires entering a code that includes the letter K in the character position rather than a number. This is one of the most obscure achievements in the game because the standard code format uses numbers for characters, not letters. Look for hints in the game's supernatural scenes and meta-plot dialogue.

Not Over Yet

After the main story concludes and you think the investigation is complete, continue entering codes and exploring. The Not Over Yet achievement rewards persistence — there is additional content after the credits that reveals more about the meta-plot. Do not stop playing when you think you have finished. Keep investigating, try new codes, and use the keyword search tool to find remaining references.

Phase 4 — Deduction Achievements

Deduction Pro

This achievement requires completing all deductions correctly. The deduction board covers character identities, fates, causes of death, and the meta-plot. Each deduction must be correct when you submit it. The progressive hint system can help you ensure accuracy — use hints if you are unsure about any deduction rather than guessing. It is better to use a hint and get the deduction right than to submit an incorrect answer.

Hint Free

This is the most challenging achievement for most players. It requires completing the entire game without using any hints. To earn Hint Free, you must identify every character, determine every fate, and solve the meta-plot entirely on your own. This achievement is best attempted on a second playthrough when you already know the answers, or by extremely thorough players who explore every scene and take detailed notes. The key is to be meticulous about viewing and re-viewing scenes, using the keyword search tool extensively, and keeping careful records of which clues point to which deductions.

Optimal Achievement Playthrough Order

For the most efficient path to 100% completion in a single playthrough, follow this recommended order:

1. Enter 01-EN-1-11 — Earn First Memory
2. Work through Part 1 chronologically — Label all locations as you discover them
3. Enter TYPE-HELP early — Earn the TYPE HELP achievement
4. Restore power each time — Earn Machine Supervisor and Technical Engineer
5. Discover all 16 locations — Earn Full House
6. Complete all Part 2 present-day scenes — Essential for meta-plot
7. Solve the meta-plot — Earn The Whole Truth
8. Find hidden scenes (00-EN-0, Plus 64, Person K, Hallucination) — Earn hidden achievements
9. View all remaining scenes — Earn Partial Recall, Total Recall, and Spectronoeticist
10. Complete all deductions — Earn Deduction Pro
11. Continue after credits — Earn Not Over Yet

If you are going for the Hint Free achievement, skip step 2's hint usage and rely entirely on your own investigation skills. This is significantly harder but saves you from needing a second playthrough.

Common Achievement Roadblocks

Missing Wintercote (WI)

Wintercote is the most commonly missed location. It is an exterior area that is not immediately obvious as a room code. Search for dialogue mentioning gardens, grounds, or exterior spaces using the keyword search tool. Try entering codes with WI as the location component.

Unable to Find Hallucination Code

The Hallucination code is deliberately obscure. If you have viewed all Chapel scenes and still cannot find the code, request the highest-level hint about supernatural phenomena. The hint system will eventually point you toward the correct code.

Spectronoeticist Progress Seems Stuck

If your scene count is not increasing, you may be missing scenes in unexpected character combinations. Try codes involving characters who do not seem to interact — some of the most important scenes involve unlikely pairings. Also check for scenes with all eleven characters (code 26-LI-1-2-3-4-5-6-7-8-9-10-11) and the hidden prologue (00-EN-0).

For more help with specific achievements, visit the complete walkthrough and scene codes pages. For the official game page, visit the Steam store.