Here is the full list of all 29 Astoria: The Holders of Power Saga achievements.
Burgle Delilah's bedroom
Acquire the Oblivion Blade
Complete all 231 pages of the Bestiary
Complete all 254 pages of the upgraded Bestiary
Find at least 15 holes of buried treasure
Let the Mermaid bless you
Defeat all 8 epic monsters
Defeat the Countess
Discover his secret
Defeat all 7 Dragons
Win all 6 Challenger Duels
Find the water cask
Defeat both Wyrms
Return to the guild and pay your dues
Find the genie, use your wishes, and set him free
Defeat Destin's company on all occasions
Navigate the Lost Forest
Defeat the Angel of Death
Find and open Mendar's tucked-away chest
Find this long-lost, tucked away treasure
Solve all puzzles in the Enchanted Tower
Rescue Jakob and Hiram
Defeat the Wolflord
Find the hidden chest in Silverdale
Defeat Radovan
Clear out the slimes for Old Macauley
Make Princess calm down
Help Bub find 5 cobra meats
Catch the rabbit