The Callisto Protocol

The Callisto Protocol

47 Achievements

1750 XP

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The Commonality

The Commonality

Uncover the mystery of Kallipolis

50 XP

5.0%

How to unlock the The Commonality achievement in The Callisto Protocol - Definitive Guide

This achievement is rewarded for visiting both secret rooms in the game.

You will be required to visit them if you are going for all of the bios collectibles.

They can be found as follows:
Chapter 3
Duncan Cole: Secret Room 1 - 04:14

Chapter 6
Yannick Sage: Secret Room 2 - 20:55
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04 Dec 2022 19:22

5 Comments
I can confirm that this is cross save/playthrough. I found Secret Room 2 in my first playthrough then on my second run on a new save the achievement popped when I found Secret Room 1.
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By BigPoppaHoyle on 05 Dec 2022 22:13
This is not required for the all bios achievement. I didn't find either secret room and I checked my inventory and both logs were missing but I still unlocked it.
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By lolykon on 07 Dec 2022 13:28
Either this or the achievement for finding all bios must be bugged, because according to Maka, you can't get one without the other. But I got the bios achievement without even needing a guide, but I don't have this achievement.
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By VideoGameOrb on 11 Dec 2022 23:08
To corroborate other's comments on this achievement: I missed it on my first playthrough (found room #1 but not #2) but still managed to unlock the bios achievement.

Second playthrough on hard, visited room #1 and then room #2 - achievement popped as soon as I stepped foot in the second room.
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By Eddy Kemp on 15 Jan 2023 17:35
I confirm you don’t need to find both rooms on the same playthrough. I only found the second room on my first playthrough. After I finished the game I loaded up a save file for the Aftermath mission and found room 1. As soon as I visited the room, it unlocked the achievement.
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By Slabba on 19 Feb 2023 03:35
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The mystery of Kallipolis is related to the two secret rooms that can be found during chapter 3: Aftermath and Chapter 6: Below.

Here are notes and screenshots showing where these rooms are located.

Chapter 3: Aftermath

External image


From the Laundry B202 room where you just fought the enemy take the left stairs down. Run forward to the other side of the room. Open the door on the right side and crawl through the vent.

External image


Once through the vent follow the path down. Once at the bottom turn left and go into the room with all the chairs to find the audio log on the main desk.
External image


Chapter 6: Below
14:46 - A little while later you will fight some enemies with no legs. After this you will shimmy through a small gap in the wall and will see a red ladder in front of you.

External image


Climb the ladder and go through the small gap in the wall in front of you. Follow the path whilst taking out the enemies. At the end of the path, you will come across a door.

External image


Walk to the right of the door to find the entrance to the room. The collectible will be on the table at the back.
External image


If having trouble feel free to use this video as a reference:


Hope this helped, thanks again.
9
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11 Dec 2022 18:24

2 Comments
Great guide, thank you! toast
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By Canezza on 01 Feb 2023 23:25
No worries
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By BabyishDuck on 03 Feb 2023 05:30
The mystery of Kallipolis is related to the two secret rooms that can be found during chapter 3: Aftermath and Chapter 6: Below.

Here are notes and screenshots showing where these rooms are located.

Chapter 3: Aftermath

External image


From the Laundry B202 room where you just fought the enemy take the left stairs down. Run forward to the other side of the room. Open the door on the right side and crawl through the vent.

External image


Once through the vent follow the path down. Once at the bottom turn left and go into the room with all the chairs to find the audio log on the main desk.
External image


Chapter 6: Below
14:46 - A little while later you will fight some enemies with no legs. After this you will shimmy through a small gap in the wall and will see a red ladder in front of you.

External image


Climb the ladder and go through the small gap in the wall in front of you. Follow the path whilst taking out the enemies. At the end of the path, you will come across a door.

External image


Walk to the right of the door to find the entrance to the room. The collectible will be on the table at the back.
External image


If having trouble feel free to use this video as a reference:


Hope this helped, thanks again.
9
0

11 Dec 2022 18:24

2 Comments
Great guide, thank you! toast
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By Canezza on 01 Feb 2023 23:25
No worries
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By BabyishDuck on 03 Feb 2023 05:30
There are two secret room needed for this trophy. The first room is in Chapter 3: Aftermath. Go into the Workshop before entering Maintenance. The second is in Chapter 6: Below. Go through the crack in the left wall just before entering the room where you turn the power on.

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23 Dec 2022 00:46

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13 Mar 2024 08:49

In order to unlock this achievement, you need to find two secret rooms located in two completely different chapters.

The first secret room can be found on the left side of the Machine Room (in Chapter 3, 'Aftermath'). Before you go down, head into Workshop B415 and then take the duct on the right. Then, follow the corridor all the way to the end to get access to this secret room. The audio log is at the table at the end.

The second secret room can be found in Chapter 6, 'Below', when you’ve made it through the Power Tunnels and are in the Power Plant. After making your way through the bottom floor, you’ll come across a ladder to go up a level. Directly opposite that ladder (with the Power Reactor control room on your right) is a small hole in the wall with a TIE Fighter-esque symbol to its right. Go in the hole and follow the path all the way to the bottom until you come to two large doors like you encountered at the first secret room. You can bypass the doors to the right where there’s a hole in the wall. Go through it and to the end of the room to pick up the audio log. Once you have done that, you'll unlock this achievement.

If you follow our implant bio collectibles guide, both are mentioned in there too.
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In order to unlock this trophy, you need to find two secret rooms located in two completely different chapters.

The first secret room can be found on the left side of the Machine Room (in Chapter 3, 'Aftermath'). Before you go down, head into Workshop B415 and then take the duct on the right. Then, follow the corridor all the way to the end to get access to this secret room. The audio log is at the table at the end.

The second secret room can be found in Chapter 6, 'Below', when you’ve made it through the Power Tunnels and are in the Power Plant. After making your way through the bottom floor, you’ll come across a ladder to go up a level. Directly opposite that ladder (with the Power Reactor control room on your right) is a small hole in the wall with a TIE Fighter-esque symbol to its right. Go in the hole and follow the path all the way to the bottom until you come to two large doors like you encountered at the first secret room. You can bypass the doors to the right where there’s a hole in the wall. Go through it and to the end of the room to pick up the audio log. Once you have done that, you'll unlock this trophy.

If you follow our implant bio collectibles guide, both are mentioned in there too.
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Find two secret rooms, this has nothing to do with audio recordings.
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11 Dec 2022 17:16

6 Comments
In the process of collecting audio recordings according to the guide, you will visit these rooms.
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By AlverMOR on 04 Jan 2023 19:00
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By Ximul on 17 Dec 2022 11:48
The rooms are found in Chapter 3: Aftermath and Chapter 6: Underground.
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By 88Alex666 on 16 Dec 2022 11:16
You need to collect all the audio recordings and find two secret rooms. If you have completed the game and have not collected one or more recordings, you can simply boot from the chapter of the audio recording that was not found, find it and the game will consider that all the recordings have been found, that is, you do not need to go through the entire game again, but only those chapters where you missed it.
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By MsQuaR on 08 Dec 2022 09:59
Secret rooms will be indicated by arrows on the walls. Can be missed if not examined
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By Evgen87 on 22 Dec 2022 08:55
To get this trophy, you need to find two secret rooms located in two completely different chapters.

The first secret room can be found on the left side of the Turbine Room (in Chapter 3 "Aftermath"). Before going down, go into workshop B415 and turn right along the air duct. Then follow the hallway to the end to reach this secret room. The audio recording is on the table at the end of the corridor.

The second secret room can be found in Chapter 6, "Down Below", when you go through the energy tunnels and end up in the power plant. After walking along the lower floor, you will come across a staircase leading to the next level. Directly opposite these stairs (to your right is the energy reactor control room) is a small hole in the wall with a TIE Fighter style symbol to the right of it. Enter the hole and follow the path all the way down until you reach two large doors similar to the ones you encountered in the first secret room. You can go around the doors on the right where there is a hole in the wall. Go through it and go to the end of the room to pick up the audio recording. Once you do this, you will receive this trophy.
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By Maxpayne95z on 02 May 2024 11:37
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During the first playthrough, I did not visit the first secret room, and the trophy with audio recordings was closed. On the second playthrough, it was enough to run into the secret room in Chapter 3 and the trophy fell out.
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06 Jan 2023 08:05