Split Fiction, the latest co-op gem from Hazelight Studios is full of missable achievements/trophies. This guide will help you unlock the "Locked Up" achievement/trophy.
Chapter 6: Maximum Security
During maximum security in chapter 6 you will get to a section that is a large circle with moving lasers that you need to avoid. You can choose the left that or the right path to get to the other side. For what it's worth the right path seemed much easier. Once you've made it past the lasers you will see a cage and control panel.

It doesn't matter who does what here, but one player must use the control panel which will open the cage, which happens to be a prison cell. Once open the other player can walk inside. The player at the control panel presses the button again to close it and the player inside can sit on the bed. This will unlock the Locked Up achievement/trophy! This is also potentially your last missable achievement/trophy outside of the final bench needed.

This little nod to Hazelight's previous game, A Way Out, is another one of those Easter eggs right infront of your face but easy to miss.
More Split Fiction Guides
- All Side Story Locations For Bookworms achievement/trophy
- All Bench Locations For Sisters: A Tale Of Two Besties achievement/trophy
- Are We Baddies? achievement/trophy
- Rose's Best Friend achievement/trophy
- Goin' Whole Hog achievement/trophy
- Huffing and Puffing achievement/trophy
- Robot Revolution achievement/trophy
- You Are Not A Robot achievement/trophy
- A Friendly Push achievement/trophy
- Cold Potato achievement/trophy
- One Bird Three Stones achievement/trophy guide
- Chair The Load achievement/trophy
- The Cake Is Not A Lie achievement/trophy
- Feed Me achievement/trophy
- We're Gonna Need A Bigger Boat achievement/trophy
- Snaaaaaaaaake achievement/trophy
- Tazed and Confused achievement/trophy