Flawless Run

(Achievement)
This Achievement unlocks after performing well in all three investigations during a single playthrough.

Investigation 1 Answers: A sharp implement, someone with hands, he didn't want to make noise, the one in his neck, he died here, he fought back.

Investigation 2 Answers: Do two of the following: ask about Reza at the store, ask about Reza at the facility, take the bandage.

Investigation 3 Answers: Save Vara to start the investigation, (see Stalker achievement), or do two of the following: ask Anna all the questions (see Interrogator 2 achievement), visit the police archives and study the blueprint, visit the store and talk to the clerk. Note that  will take up one of your investigation slots.