Introduction 00:00 - 01:55
The first door 01:55 - 03:40
Getting the wrist opener 03:40 - 04:13
Going to the railway square 04:13 - 04:53
Reaching the blocked door 04:53 - 05:35
Using the elevator 05:35 - 06:21
Egg puzzle 06:21 - 12:21
Back to the railway 12:21 - 13:12
Pick up your new friend 13:12 - 13:51
Railway setting* 13:51 - 14:15
Push the wagon 14:15 - 16:23
Release your new friend 16:23 - 18:45
Guide him to the door 18:45 - 21:24
Get the bolt gun 21:24 - 23:24
Flying lights puzzle 23:24 - 28:49
Face the consequences 28:49 - 29:28

* Depending on the setting selected, you will either save or slaughter your companion. In order to kill him, open the lower path to the right instead of the upper one shown in this guide, this will grant you the "Hand in hand" achievement instead of "Extraction".

Completting the first act will grant you three achievements:
001 - Extraction
002 - Hand on hand
003 - (Unmissable) Hazardous occurrence

Wasteland peregrination 00:00 - 05:44
Meet a new friend 05:44 - 07:06
First ball puzzle 07:06 - 07:26
Heading to the upper floor 07:26 - 09:28
Second ball puzzle 09:28 - 10:14
Stop the fan 10:14 - 11:35
Third ball puzzle 11:35 - 13:20
Getting the wrist oppener 13:20 - 13:48
Clean the tunnel 13:48 - 15:54
Fourth ball puzzle 15:54 - 17:16
Key & healing device 17:16 - 19:30
Back to the beggining 19:30 - 23:37

Completting the second act will grant you two unmissable achievements:
004 - Close Encounter
005 - Key Possession

Key upgrade 00:00 - 00:42
Unlock the path 00:42 - 03:03
Reach the spheres 03:03 - 04:20
Enter the installation 04:20 - 08:42
Raise the sphere 08:42 - 14:26
Going down 14:26 - 17:00
First node puzzle 17:00 - 17:36
Going deeper 17:36 - 20:37
Second node puzzle 20:37 - 21:22
At the lowermost point 21:22 - 27:02
A new path 27:02 - 28:48
Unlocking new gates 28:48 - 31:54
Key upgrade & escape 31:54 - 35:30

Completting the third act will grant you two unmissable achievements:
006 - Path Forward Constructed
007 - At the Lowermost Point

First penetration 00:00 - 01:10
Raise the first maze 01:10 - 01:42
Second penetration 01:10 - 03:18
Key Upgrade 03:18 - 08:58
Raise the second maze 08:58 - 10:38
Third penetration 10:38 - 15:00
Raise the third maze 15:00 - 15:40
Maze puzzle 15:40 - 17:08
Cross through the beast 17:08 - 18:24
Get to the train 18:24 - 21:33

Completting the fourth act will grant you a single unmissable achievement:
008 - Station to station

The Cathedral 00:00 - 01:23
First Homunculus 01:23 - 04:24
Awake the first body 04:24 - 04:54
Second Homunculus 04:54 - 05:52
First Vessel Boss fight 05:52 - 11:12
Third Homunculus 11:12 - 12:17
Second Vessel Boss fight 12:17 - 14:18
Free your hand 14:18 - 20:14
Remove unwanted guests 20:14 - 21:25
Reaching the Altar 21:25 - 25:17
Awake the second body 25:17 - 25:58
Transfiguration 25:58 - 30:25
Towards the Threshold 30:25 - 33:55

Completting the fifth act will grant you four unmissable achievements:
009 - Detachment
010 - Fluid flowing within
011 - Perception Beyond
012 - Fin