Most Achievments are Collectables, like all 80 Wickerlings, all 10 Walletupgrades, 1/100/1000 times using the noisemaker, all 4 Beelinies, all 42 Scarabs, all 26 Chests and all 5 Sprinkelbaubles (and the 17 different colors).

Also the Sidequests from Willo, Rinri, Thorns, Dipperloaf and Postoffice are Requiered.

Below the video is a list with a timestep to every single step in a sorted list.

there are 80 Wickerlings in 4 different areas.

Gorilla Woods:

Tracker: 2:10:32
37
Timesteps:
2:00, 2:37, 4:45, 5:24, 9:09, 9:12, 19:15, 19:57, 20:36,
21:56, 25:37, 56:28, 1:34:58, 1:39:42, 1:40:03, 1:40:45, 1:40:50, 1:42:22,
1:42:55, 1:44:41, 1:47:25, 1:48:17, 1:48:32, 1:49:48, 1:50:22, 1:54:10, 1:54:55,
1:55:45, 1:56:43, 2:03:58, 2:04:13, 2:04:40, 2:07:55, 2:08:58 (30 Mailboxes Filled required),
2:09:45, 2:24:03, 2:28:47 (Start the Ceremony required)


Ivory Peaks:

Tracker: 43:05-43:35
18
Timesteps:
28:05, 30:24, 30:28, 32:00, 32:22, 32:50, 35:05, 36:42, 37:10,
37:25, 39:48, 40:33, 41:11, 41:50, 44:15, 49:07, 51:02, 2:17:42




Marrow Hills:

Tracker: 1:52:35
16
Timesteps: 59:00, 1:00:36, 1:02:17, 1:02:33, 1:03:04, 1:03:25, 1:04:35, 1:05:25, 1:05:43, 1:07:28, 1:07:44, 1:09:15, 1:11:43, 1:18:01, 1:18:20, 1:21:37




Crystal Deaps:

Tracker: 1:58:10
9
Timesteps: 1:19:53, 1:20:42, 1:21:08, 1:21:13, 1:21:25, 1:34:05 (Blue Key required 1:31:36), 1:38:04, 2:02:26, 2:25:50 (Defeat Screetch required)

6:09
8:50
21:06
37:39
1:00:30 to 1:01:35 (Myrtle required)
1:02:17
1:18:47
1:41:50
1:46:38
1:50:52 to 1:52:50 (Quinbe required)

Timesteps:
2 at 3:45
2 at 6:25
2 at 9:30
2 at 11:30
1 at 14:05
1 at 14:42
3 at 16:21
2 at 26:37
1 at 28:15
2 at 33:15
1 at 37:37
1 at 46:35
2 at 49:30
2 at 1:07:25
1 at 1:10:47
2 at 1:12:18
3 at 1:22:52
2 at 1:26:23
2 at 1:29:18
2 at 1:31:51
1 at 1:36:08
2 at 2:06:01
3 at 2:11:20

Red Bauble: 24:16 and 31:28
Deadly Bauble: 1:06:44
Bling Bauble: 1:24:46
Creepy Bauble: 1:31:30
Sweet Bauble: 1:45:00

All 17 different Ball Colors: 1:50:52

Get the Mailbag in the Office: 21:35

Deliver to all 30 Mailboxes.
Timesteps:

22:15, 22:28, 23:20, 23:34, 24:00, 31:07, 31:50, 36:25, 48:17, 55:17,
57:47, 58:20, 1:02:02, 1:04:17, 1:06:32, 1:18:41, 1:19:02, 1:20:52, 1:34:22, 1:35:03,
1:40:21, 1:40:35, 1:43:20, 1:44:49, 1:46:17, 1:48:10, 1:49:13, 1:49:24, 2:02:20, 2:04:43




After the first 10 Mailboxes you get Access to the 3 Packages:

green package (Treek): 1:42:57
blue package (Sin): 2:03:35
violet package (Quinbe): 1:50:52 to 1:52:50

When all Mailboxes and Packages are done you can get the Great Postmanbadge: 2:08:56

Start at 2:11:16 to 2:14:42
Go to his tent: 2:15:21
piece in ivory peaks: 2:16:10 to 2:17:00
repair: 2:17:28
piece in crystal deaps: 2:20:57 to 2:21:10
again to his tent: 2:22:40
last piece at the floating ore islands: 2:23:20 to 2:24:02
Finish at his tent: 2:27:04

Get The spores at Rinri's Home: 2:40:00
Above Mokumanas Pit: 2:40:10
Spiritul Statue: 2:41:10
Ocean Breeze: 2:43:45
Frigid: 2:45:52
Warm, Dry and Quiet: 2:47:00
Finish at Rinri's Home: 2:48:00

Crimson Sprinkles, Red Ball at 2:09:10
50 times in thorns at 2:31:40
Enter Secret Cave at 2:37:08
Catch the Spirits in the ape statue at 2:38:12
Finish at Secret Cave at 2:39:25

Open All 4 Beelines and use them at least once.

Timesteps:
55:56, 1:17:46, 1:19:46, 1:48:22

Open every Chest.


There are a few besides the required Chests for other Achievments.
Timesteps:
4:43, 30:23, 1:03:55, 1:05:50 1:34:05 (green key required 1:31:11)

Dive down in the Ocean: 1:19:07

Get every single Item.

Requires:
Noismaker 2:50
Kickback: 8:20 and later 2:45:00
Sootling on a Leash: 30:40 and 36:37
Dive Fish: 1:00:25
Slug Vacuum: 13:15

Fast Dive Fish from Willo's Quest
Slug Vacuum Deluxe from Rinri's Quest

Boon of Plenty from Thron Quest
Great Postman Badge from Postman Quest

Both Skvader: 1:43:28 and 1:56:05
Treasure Map: 42:05

And the 4 Wickerling Tracker:

Gorilla Woods: 2:10:32
Ivory Peaks: 43:05-43:35
Marrow Hills: 1:52:35
Crystal Deaps: 1:58:10

Use at every of the 8 Totems 10 Wickerlings.

Timesteps:
55:50, 1:06:16, 1:20:17, 1:40:56, 1:49:48, 1:57:45, 2:18:42

There are a lot of other Achievments that comes with the normal Playthrough or other Achievments.


Lets get this party started!, All night long!, That's enough: Use the Noisemaker 1/100/1000 times: 2:50

Makin’ friends: Get Kickback: 8:20

Tastes like chicken: Suck up a Slug with the Slug Vacuum: 13:15

Honey, I'm home!: Visit the Postoffice in the Village: 21:35

Belly of the beast: Enter Fosfors Cave: 1:46:19

Under pressure: Save Spina: 1:12:00

Gone fishin': Collect the Divefish: 1:00:25

How it all began: Tempel Trials in the Underdark: section between 1:25:17 and 1:34:05

Coup de grace: Defeat Screetch: 1:59:00

Makin' more friends: Get the Leash and a Sootling too: 30:40 and 36:37

Cleaning out the cobwebs: Defeat the Spider: 48:35 to 54:35

Party time!: Deliver the Blue Package: 2:03:35

Life finds a way: Bring The Egg back to Dipperloaf: 24:16

Kickback and relax: Complete the Story after the Ceremony: 2:27:25 to 2:34:00

Thanks for using this guide.

I also did a lot of other little guidevideos to Yoku on My Youtubechannel: https://www.youtube.com/c/xWinGlp

and also Speedruns:
https://www.twitch.tv/jkxwing

https://www.speedrun.com/Yokus_Island_Express

if you wanna learn Speedrunning Yoku's IE feel free to join the discord:
https://discord.gg/68tjCxA