This is the Zodiac Speaking

This achievement is erratic and I have yet to find a definitive way to unlock it.

In the prologue, after you travel to Mount Diablo and pass the first Zodiac Killer stealth section, you'll find yourself in a shed with a puppet hanging from the rafters. To get the achievement you need to make it fall, how exactly this is done is a mystery.

I've tested this multiple times and have gotten different results each time:

-I stood in front of the puppet and mashed A button until it fell

-I kept running into it back and forth until it fell

-I equipped the bolt cutters (found inside the shed) and ran into the puppet to make it fall

-I walked right into the puppet to make it fall

-I crouched beneath the puppet and stood up to make it fall

All very different techniques, I'm sure there's a simple universal thing I'm missing but I can't figure out what. Just keep trying any of those methods until you get the achievement.