The Doppler Effect

The Doppler Effect is an achievement in and requires one to complete Contract: An Elusive Thief. As such, this is a missable achievement.
== Tips ==
* You don't have to kill the Imp to get this achievement as long as you complete the quest and turn it in.
* The doppler can escape if you don't keep up with him, so make sure you have a save before doing this.
== Trivia ==
* The name of the achievement is a play on the sound phenomenon known as the doppler effect.
Category:The Witcher 3 achievements