Here is a video guide on how to go through the game with all achievements. you can watch this video with the timeline below.
Tandem a tale of shadows Walkthrough (All Achievements Guide)
Navigation:
Chapter 1 – The Gardens
01:40 – Level 1 – Upside Down
02:31 – Level 2 – A Door, a Button
03:06 – Level 3 – A Lock, a Key
03:45 – Level 4 – Heavy Lifting
04:47 – Level 5 – Around the Pond
06:00 – Level 6 – Red Light
07:33 – Level 7 – Murky Woods
08:46 – Level 8 – See no Evil, Hear no Evil
10:13 – Level 9 – Outside the Box
12:24 – Level 10 – Zig Zag
15:07 – Level 11 – Jack In The Box
Chapter 2 – Boiler Room
19:18 – Level 1 – A Matter of Piping
20:44 – Level 2 – Half Full
22:53 – Level 3 – The Bottle
24:16 – Level 4 – Tweedle puddle riddle dum
26:55 – Level 5 – Troubled Water
29:33 – Level 6 – Snail Race
31:14 – Level 7 – Leapfrog
33:18 – Level 8 – The Lock
36:28 – Level 9 – the Eyes of the Abyss
Chapter 3 – The Kitchen
40:44 – Level 1 – Cubelings
42:11 – Level 2 – Eat or be Eaten
43:21 – Level 3 – A cube to click
45:49 – Level 4 – Soup Cubes
48:21 – Level 5 – Domino
51:11 – Level 6 – On the Grill
54:51 – Level 7 – Around the bend
56:23 – Level 8 – Out of the frying pan
Chapter 4 – Clockwork
1:00:16 – Level 1 – Hiding in the Shadow
1:02:14 – Level 2 – The music goes round and round
1:04:13 – Level 3 – Safe Passage
1:06:32 – Level 4 – Safe Passage 2
1:08:39 – Level 5 – Three Musqueteers
1:10:32 – Level 6 – On the Beat
1:12:29 – Level 7 – Music Box
1:15:08 – Level 8 – Three faces of Mother Time
Chapter 5 – Greenhouse
1:19:11 – Level 1 – Shy little friends
1:21:01 – Level 2 – What grows in the dark
1:23:16 – Level 3 – Duel in the ring
1:25:36 – Level 4 – Garden of Thorns
1:28:11 – Level 5 – Buzz buzz buzz
1:30:50 – Level 6 – Detours of Green
1:33:49 – Level 7 – Purple-Green Maze
1:37:13 – Level 8 – It’s only the end
Achievements:
Chapter 1 – The Gardens
02:20 – Achievement First Shadow
04:22 – Achievement A bridge from a door
07:10 – Achievement Secret Exit
09:52 – Achievement Last minute left
13:09 – Achievement In the Spider’s Den
17:56 – Achievement Back in the Box
Chapter 2 – Boiler Room
20:16 – Achievement Sleeping beauty
25:49 – Achievement With the Black Cat
34:19 – Achievement A spacious secret
39:23 – Achievement 6 Feet under the Sea
Chapter 3 – The Kitchen
43:58 – Achievement Through the Cubbie Jail
47:54 – Achievement Inside a wall
53:15 – Achievement Playing with fire
59:04 – Achievement Foodchain
Chapter 4 – Clockwork
1:06:07 – Achievement Taking the time
1:07:25 – Achievement Getting past the blind soldiers
1:11:54 – Achievement Not afraid of the Third Eye
1:14:04 – Achievement Music Box
1:17:54 – Achievement Your time has come
Chapter 5 – Greenhouse
1:21:12 – Achievement Before the Crossing
1:24:43 – Achievement Above the Ring
1:27:33 – Achievement Through the Green
1:33:26 – Achievement Far from the Buzz
1:42:39 – Achievement Last Shadow
Thanks to Carrot Helper for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.