YOU SHOULD HAVE 33 items in PDA when collected all collectible, while there are 30 collectibles total.

Game Completion time: 20-25hours +20-30hours for extra content if you want to solve the puzzles by yourself, no hints.
Perfection time: 35-50h + the time you need for the speedrun achievement (speedrun required only on base game), without checking vids or guides for puzzles. Signficantly less while watching solutions/videos. You need to get all collectible in one single run.
Difficulty: Speedrun achievement might require a few try and memorizing the puzzles, could be quite time consuming. Some puzzles are difficult, but with an available guide you can rest assured, that there is available material for hints in case you get stuck.

Required playthrough: 1+speedrun+2 different extra contents
Total achievements: 27+13 for the 2 extra contents.
Missable achievement: 2+6 for collectibles
Unmissable achievements: 19 included one of the ending but very unlikely to miss at least the first collectible achievement on both collectible category, so +2. +13 on extra content.

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Edited Complete walkthrough, video include fast solutions to puzzles, no 1h trying on each one, so you can find the level you want easily. Timestamps for each puzzle also listed in this guide so you can navigate to the puzzle fast you curious about.


Collectible timestamps:
check collectibles


De Gerlache test tracks (tutorial)
3:00-6:20
11:55-14:45

Shoemaker Taiga
1st: 22:12-25:30
2nd: 25:33-26:40
3rd: 26:49-28:15
4th: 28:25-31:05
5th: 31:08-32:55
6th: 33:54-35:15
7th: 35:25-37:15

Shoemaker Caves
1st: 39:35-43:00
2nd: 43:04-44:37
3rd: 44:45-47:06
4th: 47:15-49:00
5th: 49:05-52:05
6th: 52:13-58:29
7th: 58:35-1:01:01
8th: 1:01:05-1:02:10
9th: 1:02:15-1:04:52

De Gerlache Forest Cliff
1st: 1:18:13-1:22:30
2nd: 1:22:45-1:23:25
3rd: 1:23:35-1:26:14
4th: 1:26:24-1:29:25
5th: 1:29:35-1:32:40
6th: 1:32:55-1:34:52

Faustini Arid Canyon
1st: 1:41:37-1:42:28
2nd: 1:42:43-1:44:32
3rd: 1:44:39-1:49:10
4th: 1:49:20-1:51:30
5th: 1:51:48-1:57:05
6th: 1:57:11-1:59:30

Sverdrup Tropical Beach
1st: 2:12:50-2:15:30
2nd: 2:15:45-2:20:40
3rd: 2:21:21-2:24:14
4th: 2:24:25-2:31:25
5th: 2:31:37-2:39:00

Shoemaker Glaciers:
1st: 2:45:55-2:51:00



Shoemaker Glaciers:
2nd: 0:01-5:00
3rd: 5:10-9:25
4th: 9:30-14:30
5th: 14:40-19:00
6th: 24:05-29:00

De Gerlache Forest River
1st: 35:43-42:10
2nd: 42:28-47:58
3rd: 48:17-55:55
4th: 56:04-1:00:12
5th: 1:00:19-1:03:55
6th: 1:04:05-1:13:36
7th: 1:13:60-1:24:42

Faustini Desert Rift
1st: 1:32:10-1:35:30
2nd: 1:35:45-1:41:38
3rd: 1:42:20-1:50:55
4th: 1:51:40-1:56:25

Sverdrup Tropical Jungle
1st: 2:04:40-2:14:30
2nd: 2:15:20-2:22:27
3rd: 2:22:38-2:28:48
4th: 2:30:11-2:39:10
5th-Final Level: 2:40:00-2:48:45

There are 30 collectible in Relicta, but 33PDA entries!!! as at the beginning of the game you get 3 extras or the first collectibles provide those additionals. Each collectible could be found at base areas, none of them found at puzzle areas.
You need to get all collectibles in one single playthrough.
If you missed one while exploring the first puzzles in each dome it is not a problem, you can still backtrack to there WHEN you will need to revisit that dome and finish the other puzzles there. But keep in mind, you used the elevator in a dome for the last which gets you to the last puzzles in that area then you can't return anymore.
Collectibles listed in chronological order in this guide, with some additional information.

1: First is a PDA and should be on the middle of your way as it is also the part of the tutorial, the game warns about it and it also mentions you need to push button I. Timestamp on video 1: 11:15

2: Artifact: Kira's Picture. Inside your room after talking with your daughter and your boss via your computer. It is a picture on the desk. Timestamp on video 1: 16:08

3: PDA "Propaganda - Opporutnines out of this world". When leaving your room and living quarter area head to the other living quarter area, it is inside of a room and then inside of a cabinet. Timestamp on video 1: 16:35

4: PDA "News - A brief chronology of the Orbital Era". Inside the main area of the dome complex, on a desk. Timestamp on video 1: 17:19

5: Email: Relicta List. Can be found while heading to the Shoemaker Taiga, after leaving the Maglev it is on a bench. Timestamps on video 1: 20:55

6: Artifact - Coffee Mug. Inside of a room while heading to Shoemaker Taiga. Timestamps on video 1: 21:13

7: Artifact - Patels Picture. Inside Assembly Room, after Taiga while heading to Shoemaker Caves Elevator. Timestamp on the video: 37:42

8: PDA - "Diary Logs - Angie's Logbook". At Maglev station on a bench while heading tho Shoemaker Caves elevator. Timestamps on video 1: 38:18

9: PDA - "Emails - Ethical Concerns" On a bench after leaving Shoemaker Caves before the Maglev Station. Timestamps on video 1: 1:07:10

10: PDA - "Emails - The Thing in Ibn Bajk" while heading to the De Gauche crater Cliffs after Relicta Lockdown event. Need to take stairs down to laboratory. Timestamps on video 1: 1:16:18

11: Artifact - "Relicta Fragment", same room as 10th collectible (The Thing in Ibn Bajk). Timestamp on video 1: 1:16:29

12: Artifact - "Kwarizmis picture" after De Gerlache Cliffs, after leaving elevator go straight, down stairs to the laboratory. Timestamps on video 1: 1:36:00

13: News - 72' Hostilities Cease. After Kwazimis Picture head back and inside a glass corridor it is on a green box, slighlty missable because of the orange box covering it from the angle you coming. Timestamps on the video: 1:36:29

14: PDA - "Documents - Chandra Expedition Hearing Transcript" Just once you arrived to Fauistini, not far from the maglev station. Timestamp on the video 1: 1:40:02

15: Artifact " Sassanid Order 2nd cl." not much after previous collectible there will be a corridor and stairs to your left, go down to that laboratory, collectible is there. Timestamps on the video: 1:40:26

16: PDA "News - Chandra Expedition to reopen moon base" At Faustini arid canyon maglev station, after the Faustini Arid Canyon Puzzles. Timestamps on video 1: 2:05:50

17: PDA "Diary Logs - Kwarizmi Private" While heading to tropical beach puzzles in Svendrup Crater dome, inside of laboratory room. Timestamps on video 1: 2:09:55

18: Artifact "Hardcover Book". Inside equipment room which is right next to the room with previous collectible. Timestamp on video 1: 2:10:14

19: PDA "Propaganda - Ragnar Nquyen's acceptance speech" Right after previous 2 collectible, in next room. Timestamps on video: 2:10:45

20: PDA "Let the red moon Rise!" Svedcrup crater dome, after Tropical Beach puzzles. Timestamp on the video 1: 2:40:18

21: Artifact "Maglev" After previous collectible, downstairs, under the stairs. Timestamp on video 1: 2:40:35

22: PDA "Diary - Laia's Dirty Secret" While heading to Shoemaker Glacier puzzle area, inside "test Area" room. Timestamps on the video 1: 2:43:55

23: Inside of a Laboratories room, while heading to Shoemaker Glacier puzzle area, right before the elevator. Timestamp on video 1: 2:44:45

24: Artifact - "Mitorchid" De Gerlache Crater base, while heading to Forest River puzzle area, behind a door with laboratory sign. Timestamps on 2nd video: 33:52

25: PDA - Documents "orbital politics" De Gerlache Crater base, while heading to Forest River puzzle area, next to some crates. Timestamps on 2nd video: 34:40

26: Artifact "Music Poster" Fauistini crate base area. When heading to the desert area it is in like the second room after leaving the maglev room. Timestamps on 2nd video: 1:29:00

27: Artifact - "Laias Picture" Faustini crater base area. While headint to the desert area there is a side door which leads to a small office. It is on the desk. Timestamps on 2nd video: 1:29:45

28: PDA - Emails "About Biomes and Dome Maintenance". Fauistini crater base area, while heading to desert puzzle area, inside of a cabinet. Timestamps on 2nd video: 1:30:15

29: PDA - Documents "Intel Requests" Svedrup crater base area, while heading to desert jungle, last puzzle area. Once this collected you should get the Senior Researcher achievement. Timestamps on 2nd video: 2:02:20

30: Artifact - "Solidaridad" Svedrup crater base area, while heading to desert jungle, last puzzle area. Once this collected you should get the Master Collector achievement. Timestamps on 2nd video: 2:02:45

each award one achievement. If you want to experience the other ending or just get the achievement for the other one then you can just use Contine on the main menu instead starting a new game. Autosave is before the decision.


Complete the game in 6 hours.
-paused time/being at menu not counts
-it is not required to do the walkthrough in one single session. I started it at an afternoon, then finished on the next day
Skipping story options with R will speed up, but it is impossible on first walkthrough, unless you learn every single puzzle from my walkthrough video beforehand. That would actually kill the fun on first walkthrough.

However, it is suggested to refresh your memories on the puzzles with my walkthrough vids, else you still could be short on time and you need to retry on another new game.

Timestamps (available on YT too)

0:00​ Intro
2:20​ Level A
10:44​ Level B
18:28​ Level C
24:48​ Level D
30:21​ Level E
38:53​ Level F
47:59​ Level G
51:55​ Level H
59:40​ Level I
1:08:50​ Level J
1:16:14​ Level K
1:30:44​ Level L
1:37:10​ Ending

Timestamps:
0:00 Story Intor
5:26 Puzzle Area 1
14:10 Puzzle Area 2
20:00 Puzzle Area 3
31:32 Puzzle Area 4
37:12 Puzzle Area 5
50:32 Puzzle Area 6
1:00:07 Puzzle Area 7
1:08:40 Puzzle Area 8
1:14:55 Puzzle Area 9
1:22:11 Puzzle Area 10
1:30:37 Puzzle Area 11
1:41:49 Puzzle Area 12
1:49:09 Ending