Prison Architect
16 Achievements
50-60h
Spare The Rod
Stopped a riot of 50 or more prisoners
31.6%
How to unlock the Spare The Rod achievement in Prison Architect - Definitive Guide
If you don't have a prison with 50+ prisoners, you can edit the speed of time in the config file of your save, so speed up time so that you can order prisoners super fast (don't worry about supplying them with rooms etc, you want them to kick off afterall).
Start a new game and build one massive room! Make it a holding cell, put 70 beds in it, hire 2 guards, get 70 inmates then wait but don't worry about food as this angers them and gets them riled up quicker. Once the riot starts, hire 30+ guards and let the emergency riot squad come and calm it down.
This is possible to be unlocked naturally during some of the larger Prison Warden maps by in-taking the maximum number of prisoners you can house and waiting for the tinder box to explode.
To get this in Prison Architect mode build a large holding cell and fill it with 100+ beds. Fill the cell with prisoners and lock them in it. After a while they'll start to riot. Wait until the screen says 50+ are rioting and then employ a load of guards and/or bring in the riot squad to end the riot.