Here is the full list of all 17 Who Pressed Mute on Uncle Marcus? achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Accuse every suspect.
Accuse Mum.
Find the killer.
Accuse Nan.
Accuse Bradley.
Don't be persuaded by June to submit the wrong answer.
Accidentally come clean about cheating.
Praise mum too much.
Answer that Lottie's biggest fear is baldness when playing with Nan.
Saved Uncle Marcus.
Accuse Aunty June.
Accuse Lottie.
Accuse Toby.
Uncle Marcus reveals he has been poisoned.
Start the quiz.
Don't be persuaded by Toby to submit the wrong answer.
Mum fools Toby into showing empathy.