Full list of all 19 Far Cry 3 Blood Dragon achievements worth 400 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Own all Weapons Attachments
Kill 25 Dragons
Finished Final Showdown
Destroy 5 Braincages
Reach Maximum Level and Become the Ultimate Badass
Headshot Every Type of Enemy
Kill all the Animal Types
Finish all the Predator's Path Quests
Find all TV SETS to Decrypt the Hidden Message
Find all of Dr. Carlyle's Notes
Find all VHS Tapes
Finish all the Hostages Situations
Finish all the Garrisons
Kill a Dragon with the Bow
After saving Darling, enter Combat Mode with a Dragon and Return to Stealth
Kill Your First Dragon
Jump Down from 50 Meters
Finished First Garrison
Finished Helicopter Entry