Space Legends: At the Edge of the Universe has neither Steam nor in-game achievements at the time of posting this guide (7th August 2018).

Video contains...
@ 4:58 = HOG #1, Cabinet to the right of the door, in your quarters.
@ 6:45 = Puzzle #1, Technical Module (room to the left of the stairs), door lock code.
@ 8:39 = Puzzle #2, Steve's room, assembling circuit board puzzle.
@ 9:38 = Puzzle #3, Observatory, snake (impulses) puzzle on computer monitor.

Video contains...
@ 0:00 = Puzzle #4, Greenhouse, computer monitor, assemble picture puzzle.
@ 3:31 = HOG #2, Cabinet on the left side of your room (starting room), again (2nd time).
@ 4:43 = Puzzle #5, Airlock, console wire puzzle.
@ 7:07 = Puzzle #6, Technical Module, top cupboard, repeat sound sequence puzzle.
@ 7:55 = Puzzle #7, Observatory, mixing phials (test tubes) puzzle.
@ 10:01 = Puzzle #8, Spaceship door lock puzzle.
@ 11:07 = Puzzle #9, Inside the spaceship, fingerprint puzzle.
@ 12:03 = HOG #3, Inside the spaceship, computer monitor, hidden word puzzle.
@ 13:11 = Puzzle #10, Inside the spaceship, left of the chair, three image combination lock.

Video contains...
@ 0:36 = Puzzle #11, Inside the spaceship, medicine supply system pipe flow puzzle.
@ 4:32 = Puzzle #12, Outside crashed spaceship, jigsaw puzzle.
@ 7:27 = HOG #4, Prison cell.
@ 11:55 = Puzzle #13, Room beyond the prison cell, key lock puzzle on the wall, to the right of the gate.
@ 13:27 = Puzzle #14, Tavern, beer pitcher puzzle on the bar.

Video contains...
@ 0:49 = HOG #5, Inside the tavern, door at the top of the stairs.
@ 3:26 = HOG #6, Blacksmiths (Forge), cellar, accessed from outside to left of the fountain).
@ 7:12 = HOG #7, Blacksmiths (Forge), cellar, accessed from outside to left of the fountain), again (2nd time).
@ 9:57 = HOG #8, Inside the tavern, door at the top of the stairs, again (2nd time).
@ 11:30 = Puzzle #15, Inside barn loft (upstairs), cog wheel puzzle.

Video contains...
@ 0:00 = Puzzle #16, Sliding spare parts box puzzle, inside barn on ground floor.
@ 7:17 = Puzzle #17, River/Bridge, scales and weights puzzle on wall to right of prison door.
@ 9:56 = Puzzle #18, Inside the castle, kitchen, four image sequence puzzle on wall, left side.
@ 12:31 = Puzzle #19, Inside the castle, hallway, five sliding rectangular gem stone puzzle.
@ 13:18 = HOG #9, Castle garden, base of statue.

Video contains...
@ 0:55 = HOG #10, Castle garden, base of statue, again (2nd time).
@ 2:33 = Puzzle #20, Castle gate/guard house, square puzzle on table.
@ 3:01 = Puzzle #21, Princess's bedroom (in the castle), alchemy puzzle.
@ 6:00 = HOG #11, Castle cellar, barrels to the right.
@ 7:32 = Puzzle #22, Castle cellar, cabinet lights and buttons puzzle.
@ 9:40 = Puzzle #23, Train station (cave side), route puzzle, in booth to the left of the clock.

Video contains...
@ 0:19 = Puzzle #24, Outside the casino, in the city, van door lock puzzle.
@ 1:36 = HOG #12, Outside the spaceport, in the city, in front of the town council building.
@ 3:35 = HOG #13, Castle cellar, barrels to the right, again (2nd time).
@ 4:50 = Puzzle #25, Train station (city side), light reflection puzzle.
@ 5:58 = Puzzle #26, Inside spaceport, symbol tile puzzle on the console.
@ 7:52 = HOG #14, Outside the spaceport, in the city, in front of the town council building, again (2nd time).
@ 8:53 = Puzzle #27, Inside the town council building, on reception desk, use buttons to move balls puzzle.
@ 10:15 = Puzzle #28, Inside the town council building, office upstairs, ball flow puzzle on left wall.

For anyone with problems viewing the embedded videos in this guide (such as those in China having to use a VPN to watch videos on YouTube) here's a link to the playlist...
https://www.youtube.com/playlist?list=PLgrKGjfHCc0jEOAG3lzlBaqKR9FMtID5c

I hope you found this guide of help, all comments, suggestions and criticism (constructive) is gratefully received.

An A to Z list of my Steam achievement guides and walkthroughs can be found @ https://cs2bus.com/sharedfiles/filedetails/?id=1502405720
If you would like to get a notification in your activity feed when I post a new guide, just click the "follow anrkyuk" button on my profile guide list...
https://cs2bus.com/id/anrkyuk/myworkshopfiles/?section=guides