Below are video guides for all myth challenges. There are 17 myth challenges in this DLC; 9 in Peng Lai and 8 in Bu Zhou. I have broken the videos down based on the islands of Peng Lai & Bu Zhou. There is also a longer video combining all of them.
All Myth Challenges:
Timestamps:
0:03 Sunchaser #1 (Peng Lai)
0:49 Musical #1 (Peng Lai)
1:40 Mural #1 (Peng Lai)
2:08 Sunchaser #2 (Peng Lai)
3:16 Mural #2 (Peng Lai)
4:26 Bagua #1 (Peng Lai)
8:40 Musical #2 (Peng Lai)
10:12 Bagua #2 (Peng Lai)
14:44 Sunchaser #3 (Peng Lai)
16:00 Bagua #3 (Bu Zhou)
19:44 Musical #3 (Bu Zhou)
21:20 Musical #4 (Bu Zhou)
22:25 Sunchaser #4 (Bu Zhou)
23:29 Sunchaser #5 (Bu Zhou)
24:34 Bagua #4 (Bu Zhou)
30:41 Mural #3 (Bu Zhou)
32:23 Mural #3 (Bu Zhou)
Peng Lai:
Timestamps:
0:03 Sunchaser #1
0:49 Musical #1
1:40 Mural #1
2:08 Sunchaser #2
3:16 Mural #2
4:26 Bagua #1
8:40 Musical #2
10:12 Bagua #2
14:44 Sunchaser #3
Bu Zhou:
Timestamps:
0:03 Bagua #1
3:46 Musical #1
5:22 Musical #2
6:28 Sunchaser #1
7:31 Sunchaser #2
8:36 Bagua #2
14:43 Mural #1
16:25 Mural #2