Flashback (cloud recess studying and water monster) - Ch 30-45
Man eating castle + drunkness : 45 - ~70
Frostbyte + paper/grave maker village : 70 - 110
Drunkness with headband: 116 - 119
Sect meetup/ finding the head : 120 - 145
Flashback (hostage - killing big turtoise) - 147-172
Looking for clues in the music - 173-178
Burial mounds zombie fight -179 -218
Flashback (archer tournament+finding Weng Ning / trap). 184 - 209.5
Rest after the fight/finding out secret - 219 -224
Temple with array, drunkness 3. - 225 - 233
Final fight with big bad - 234-253
End - 254-259
Final conclusion: the beginning was really good, the end got a bit over joked and lovey-dovey which made the fighting and last emotional outbursts a bit weak. It has a happy ending and 2 smut scenes, one of which is drawn as well.
I feel like the story closes to the original light novel is a mash-up of this manga and the anime together, because there are scenes which isn't in the manga and scenes thats supposedly differ from the original story a bit.
Mo Dao Zu Shi