Here is the full list of all 32 Curse of the Assassin achievements.
Find all the artwork in Curse of the Assassin
Complete the gamebook in Classic Mode
Visit all the taverns in the story
Meet all the creatures from folklore and legend
Successfully use your hunting skills
Hear the 'Endecha de la Sangre'
Recruit all members of the Death Hawks
Rescue two people very close to you
Fool the mighty Coca Rabixa
Complete the gamebook in Adventurer Mode
Return a ring to the rightful owners
Return a cry three times when out at sea
Save a companion from some watery rapids
Offer your life for another
Laugh hysterically with Esplandian
Purify the water in a well
Meet a Sanziana and receive a special gift
Complete the gamebook in Casual Mode
Steal a sheep
Successfully report back to the Head Gaoler
Receive a special blessing
Find out the location of the Jewel of Orlandes
Find out the meaning behind the 'breadbasket of Orlandes'
Become possessed by an ultimate boss
Defeat the leader of the Hombre Peces
Find the best armour in the gamebook
Roll 3 ones in one dice roll
Find the best weapon in the gamebook
Roll 3 sixes in one roll
Discover a dastardly plot
Receive a threatening letter
Learn the secrets of Coyote Lore