Darkshore Quests

This zone is definitely heavily dependent on drop quests. To name a few there are:

Hellscream's Missive
Maw of the void quest
Overseer's Orders
Rit'ko's Key

Also not quite a drop quest, but definitely in a hard to find location is:

Protection quest

Which although it ends in ashenvale, it still counts towards darkshore quests

If anyone else can think of more post it in a reply! Hope this helps :)

Here's a list of all quests which count for this achievement in the order in which they were intended to be completed...
 

01. Breaking Waves of Change (Optional)
02. The Last Wave of Survivors
03. Threat from the Water
04. A Taste for Grouper
05. The Boon of the Seas
06. Buzzbox 413
07. No Accounting for Taste
08. Buzzbox 723
09. A Cure In The Dark
10. The Corruption's Source
11. Bearer of Good Fortune (Optional)
12. A Troubling Prescription
13. Writings of the Void (Optional)
14. The Final Flame of Bashal'Aran
15. A Love Eternal
16. Solace for the Highborne
17. A Lost Companion
18. Unsavory Remedies
19. Twice Removed
20. Ritual Materials
21. The Ritual Bond
22. Spirit of the Stag (Blessing Choice)
23. Spirit of the Moonstalker (Blessing Choice)
24. Spirit of the Thistle Bear (Blessing Choice)
25. Grimclaw's Return
26. Power Over the Tides
27. An Ocean Not So Deep
28. The Shatterspear Invaders
29. Remnants of the Highborne
30. Shatterspear Laborers
31. Reason to Worry (Optional)
32. Swift Response
33. One Bitter Wish

34. Timely Arrival
35. War Supplies
36. Denying Manpower
37. Strategic Strikes
38. On the Brink
39. The Looting of Althalaxx
40. The Front Line
41. The Ancients' Ire
42. Ending the Threat
43. Disturbing Connections (Optional)
44. Remembrance of Auberdine
45. Twilight Plans
46. The Twilight's Hammer
47. In Aid of the Refugees
48. Coaxing the Spirits
49. Against the Wind
50. Three Hammers to Break
51. The Last Refugee
52. Call Down the Thunder
53. Malfurion's Return
54. The Last Wildkin
55. Aroom's Farewell
56. Elune's Fire
57. The Wildkin's Oath
58. Protector of Ameth'Aran
59. Calming the Earth
60. Sworn to Protect
61. The Land Is in Their Blood
62. Mutual Aid
63. Soothing the Elements
64. The Blackwood Pledge
65. The Emerald Dream
66. The Waking Nightmare

67. Leaving the Dream
68. The Eye of All Storms
69. Mounting the Offensive
70. Consumed
71. The Seeds of Life
72. An Ounce of Prevention
73. In Defense of Darkshore
74. The Devourer of Darkshore
75. What's Happening to the Blackwood Furbolg?
76. The Bear's Paw
77. The Bear's Blessing
78. Cleansing the Afflicted
79. The Defiler
80. Jadefire Braziers
81. One Shot. One Kill.
82. Leave No Tracks
83. Stepping Up Surveillance
84. Unearthed Knowledge
85. Sweeping Clean the Ruins
86. Swamped Secrets
87. The Absent-Minded Prospector
88. Got Some Flotsam?
89. The Titans' Terminal
90. A New Home
91. Soggoth and Kronn
92. The Slumbering Ancients
93. Naga In Our Midst
94. The Darkscale Warlord
95. The Offering to Azshara
96. The Tides Turn Against Us
97. The Battle for Darkshore

 
If you can't figure out which quests you're missing for the achievement here's a macro you can run that will list out all incomplete quests from the zone.

Macro #1 (for quests 1-27)

/run for k,v in pairs({12865,0,4,19,2,3,9,10,36,11,39,313,15011,44,45,43,46,80,47,48,51,49,50,79,81,5,42})do v=v+13518 print(IsQuestFlaggedCompleted(v) and "" or k..". \124cffffff00\124Hquest:"..v..":\124h[Quest "..v.."]\124h\124r: INCOMPLETE")end


Macro #2 (for quests 28-54)

/run for k,v in pairs({85,1,0,2,4,7,6,5,3,8,9,340,86,10,11,87,66,92,15,97,43,38,39,101,54,69,73})do v=v+13504 print(IsQuestFlaggedCompleted(v) and "" or (k+27)..". \124cffffff00\124Hquest:"..v..":\124h[Quest "..v.."]\124h\124r: INCOMPLETE")end


Macro #3 (for quests 55-80)

/run for k,v in pairs({53,57,58,54,59,60,50,51,55,56,61,62,415,63,377,356,357,400,360,366,0,1,19,20,21,47})do v=v+13525 print(IsQuestFlaggedCompleted(v) and "" or (k+54)..". \124cffffff00\124Hquest:"..v..":\124h[Quest "..v.."]\124h\124r: INCOMPLETE")end


Macro #4 (for quests 81-97)

/run for k,v in pairs({0,8179,8235,8183,8194,8199,8198,8196,8205,8197,8180,8182,8240,8186,8187,8185,8184})do v=v+5713 print(IsQuestFlaggedCompleted(v) and "" or (k+80)..". \124cffffff00\124Hquest:"..v..":\124h[Quest "..v.."]\124h\124r: INCOMPLETE")end


If you jump into the Maw of the Void (the whirlpool thing) you go into a cool little cutscene where you warp into a sunken ruin place -- killing the named NPC drops http://www.wowhead.com/item=64450-- got me to 90

(p.s. will also take care of Ghosts in the Dark)