Bloodmyst Isle Quests

First off, the tooltip may say xx/65 quests but it is actually a total of 60 quests you have to complete, not 65.

To consolidate some of the helpful info already here for those last few, hidden quests:

1) Find and kill Cruelfin for Red Crystal Pendant
2) Find and kill Tzerak for Tzerak's Armor Plate
3) Visit Clopper Wizbang at his hideout in nothern Bloodmyst Isle where he may give you a replacement Weathered Treasure Map that will start a quest.
4) If Messenger Hermesius doesn't offer any quests in Blood Watch then take the hike down to Admiral Odesysus at Odesyus Landing, southern Azuremyst Isle to (hopefully) get The Bloodcurse Legacy.

Map for all quest givers on the isle.

In addition to the spider guy hiding behind the tree that was already mentioned, there are 2 drop quests that finally got me my 60/65 for the achievement. One is Tzerak's Armor Plate from a demon boss (Tzerak) that wanders around Nazzivian, and the other is the Red Crystal Pendant that drops from Cruelfin in the southern edge of the Isle.

I also had been missing the chain that starts with Urgent Delivery, but don't forget to do A Small Start first.

Hope this helps!

I just wanted to give a single comment for everyone that is a listing of all the different comments posted here. I hope this helps a few people out.

Two drop quests:
From Cruelfin, get the Red Crystal Pendant
From Tzerak, get Tzerak's Armor Plate

Two out-of-the-way quest givers:
Researcher Cornelius

Prince Toreth

Be sure to check in with Vindicator Boros after you've turned in Irradiated Crystal Shards, as the repeatable ? overwrites the ! for quests.

Finally, there are two chains that start on Azuremyst Isle but finish on Bloodmyst Isle.
You must complete the quest chain that begins with Learning the Language to be able to speak with Princess Stillpine
You must complete the one quest A Small Start (not the entire chain) to be able to get Urgent Delivery

Hope this helps some folks to have one message for all the possible misses.

Also, if you are not a Draenai, you get the achievement at 60/65 quests. I presume this is because of the racial-only quests.