Amulet of Time: Shadow of La Rochelle contains neither Steam nor in-game achievements at the time of writing, it also does not contain any form of collectable.

In my video playthrough below I have noted with time markers all puzzles and hidden object scenes along with some other time markers to try and help you find the information you require as easily and quickly as possible.

Video contains...
@ 1:40 = Puzzle #1 - Chest lock puzzle, Room With A Fireplace.
@ 2:06 = HOG #1 - Inside the chest, Room With A Fireplace.
@ 3:23 = HOG #2 - Table to the left of the fireplace, Room With A Fireplace.
@ 4:39 = HOG #3 - Chair, Cellar.
@ 7:13 = HOG #4 - Front Door.
@ 9:28 = Finding the 15 dress parts, Seamstress.
@ 9:46 = Puzzle #2 - Untangle threads puzzle, Mannequin.
@ 10:57 = HOG #5 - Chest, Folding Screen.
@ 12:12 = HOG #6 - Drawers, Folding Screen.

Video contains...
@ 0:21 = HOG #7 - Chest, Window.
@ 1:36 = HOG #8 - Shelf to the right of the door, The Door.
@ 2:31 = HOG #9 - Drawers, Laboratory Bench.
@ 4:11 = Puzzle #3 - Rotating circle puzzle, Window.
@ 5:30 = HOG #10 - Drawers, Laboratory Bench. 2nd Time.
@ 9:05 = Puzzle #4 - Jewellers door lock puzzle, The Street.
@ 9:55 = Puzzle #5 - Sliding block puzzle, The Furnace.
@ 10:11 = Puzzle #6 - Keys puzzle, The Furnace.
@ 12:06 = Puzzle #7 - Monogram puzzle, The Furnace.
@ 13:42 = HOG #11 - Table in front of window, The Furnace.

Video contains...
@ 0:11 = HOG #12 - Drawers, The Work Bench.
@ 1:02 = HOG #13 - Shelves to the left, The Work Bench.
@ 1:48 = Puzzle #8 - Clock puzzle, The Door.
@ 3:05 = Puzzle #9 - Elephant sliding squares picture puzzle, The Work Bench.
@ 4:57 = HOG #14 - Barrel to the right of the stairs, The Yard.
@ 5:42 = HOG #15 - Cart, The Yard.
@ 8:16 = HOG #16 - Table to the left of the fireplace, Fencing Hall.
@ 9:56 = Puzzle #10 - Rotating circle picture puzzle, The Window.
@ 11:11 = HOG #17 - Drawers, Laboratory Bench. 3rd Time.
@ 12:08 = HOG #18 - Shelf to the right of the door, The Door. 2nd Time.
@ 13:08 = HOG #19 - Chest, Window. 2nd Time.

Video contains...
@ 0.06 > 0:14 = WARNING Strobe lighting.
@ 0:53 = Placing items on the tapestry, The Window.
@ 3:32 = Chess puzzle solution.
@ 3:41 = Puzzle #11 - Chessboard puzzle, Fencing Hall.
@ 4:35 = Puzzle #12 - Shield picture sliding square puzzle, Fencing Hall.
@ 7:10 = HOG #20 - Table to the left of the fireplace, Fencing Hall. 2nd Time.
@ 7:50 = HOG #21 - Fireplace, Fencing Hall.
@ 8:42 = Puzzle #13 - Weapons board, Fencing Hall.
@ 9:35 = Puzzle #14 - Dartboard puzzle, Fencing Hall.
@ 11:53 = HOG #22 - Box, The Cell.
@ 13:48 = HOG #23 - Skeleton, The Cell.

Video contains...
@ 0:51 = Locating the gear pieces, Dungeon Hallway.
@ 1:08 = Puzzle #15 - Door lock gear puzzle, Dungeon Hallway.
@ 2:01 = Puzzle #16 - Labyrinth puzzle, Beyond the Dungeon Door.
@ 4:16 = HOG #24 - Box on the floor, Upstairs/The Easel.
@ 4:55 = HOG #25 - Set of drawers, Upstairs/The Easel.
@ 6:01 = Puzzle #17 - Painting puzzle, Upstairs/The Easel.
@ 8:01 = Locating glass lens pieces.
@ 8:51 = Puzzle #18 - Rotating symbol puzzle, The Ladder.
@ 10:00 = Locating the catapult parts.
@ 10:12 = HOG #26 - Set of drawers, Upstairs/The Easel. 2nd Time.
@ 11:06 = HOG #27 - Box on the floor, Upstairs/The Easel. 2nd Time.
@ 12:14 = Locating the runes.
@ 13:43 = Rune lock puzzle, The Ladder.

Video contains...
@ 0:10 = Locating the horsemen, The Bedroom.
@ 0:26 = Puzzle #19 - Prancing horse puzzle, The Bedroom.
@ 1:24 = HOG #28 - Workbench, Secret Passageway.
@ 3:34 = Puzzle #20 - Aquarius picture puzzle, The Labyrinth Entrance.
@ 4:31 = HOG #29 - The Labyrinth.
@ 6:16 = Locating the Spyglass base pieces, The Observatory.
@ 6:38 = HOG #30 - Under the platform, The Observatory.
@ 7:58 = Locating the Spyglass pieces, The Observatory.
@ 8:07 = HOG #31 - Case, The Observatory.
@ 9:07 = Assembling the spyglass, The Observatory.
@ 9:37 = Locating the map and pins, The Observatory.
@ 10:32 = Using the spyglass, The Observatory.
@ 11:09 = Puzzle #22 - Cleaning the sundial, The Labyrinth.
@ 11:47 = Using the spyglass, 2nd time, The Observatory.
@ 12:18 = HOG #32 - Case, The Observatory. 2nd Time.

Video contains...
@ 0:01 = HOG #33 - Shelves, Kitchen Window.
@ 0:56 = HOG #34 - Cooker, Kitchen Window.
@ 2:05 = Puzzle #23 - Hanging utensils puzzle, Kitchen Window.
@ 4:17 = Puzzle #24 - Which apple puzzle, Kitchen.
@ 5:06 = HOG #35 - Cooker, Kitchen Window. 2nd Time.
@ 6:14 = HOG #36 - Shelves, Kitchen Window. 2nd Time.
@ 7:41 = Puzzle #25 - Moon circle puzzle, Entrance Hallway.
@ 8:36 = Puzzle #26 - Chest lock letter puzzle, Kitchen.
@ 10:09 = HOG #37 - Dressing table, The Bath.
@ 11:10 = HOG #38 - Cabinet, Fireplace.
@ 13:03 = Puzzle #27 - Net puzzle, The Bed.

Video contains...
@ 0:03 = Puzzle #28 - Harp puzzle, The Bed.
@ 1:43 = Puzzle #29 - Black and white participants picture puzzle, The Bath.
@ 3:05 = Door lock card puzzle, The Aviary.
@ 4:01 = HOG #39 - Fountain, The Aviary.
@ 6:11 = Clock puzzle #1.
@ 6:38 = Clock puzzle #2. Sorry I took my sweet time with this one and totally failed to spot the obvious.
@ 8:50 = Clock puzzle #3.
@ 10:16 = Clock puzzle #4.

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://youtube.com/playlist?list=PLgrKGjfHCc0gudbK0WErwOwP73fQesyK-

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