1. Walkthrough overview
Agatha Christie: The ABC Murders is a typical point-and-click detective type adventure game. It requires two playthroughs to unlock all of the achievements because there are achievements for making mistakes and these mistakes prevent you from earning other success achievements.
You can’t actually fail the main storyline – no matter how many mistakes you might make, you can always manage to continue on without that piece of evidence.
While progress towards achievements accumulates across playthroughs, there is no record anywhere of what mistakes or successes you have made. And you can’t make the same mistake over and over again for it to count. Thus, the strategy will be to do two playthroughs – the first where you do everything perfectly and the second where you do everything wrong. For the second walkthrough, you can skip several optional steps to make it go faster.
The same general steps are required for both playthroughs, but the walkthrough will be annotated with steps are specific to your first or second game.
The original release was plagued with glitches that can make certain achievement not unlock properly. These appear to all be resolved in the current version. If you ever played the game unpatched (or with an older patch), you might have issues. Often, the only workaround is to delete your save games completely and start over from scratch.
Note that some achievements don’t unlock immediately but unlock at the end of the scene or conversation. Don’t worry if it doesn’t unlock instantly, but if you have control of your character and a missable achievement still hasn’t unlocked, you’ve probably missed a step.
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