Here is the full list of all 41 The Darkest Tales achievements.
Unlock the berserk form.
Defeat Merlin the dragon.
Defeat all the phantoms in the castle.
End your love story.
Unlock the shotgun.
Defeat all the rubber duck mini-bosses.
Unlock the greatsword.
Unlock the knight armor.
Leave the fish woman speechless.
Listen to the fish woman's entire song.
Unlock the harpoon.
Defeat SCIENCE!
Stop and fight during the speed test.
Unlock the spear.
Fulfill all the Jinn's wishes.
Defeat the kid who wouldn't grow up.
Unlock the boomerang.
Defeat the pirate captain and her crew.
Cut 33 poisonous apples on the fly!
Defeat the fairy queen.
Unlock the axe.
Unlock the pirate suit.
Run away from the king and his giant wife.
Stitch up your wounds 42 times.
Use your bow to defeat a zombie egg.
Unlock the bow.
Defeat 9 zombies by offering them some coffee.
Dodge 9 lightnings at the last possible moment.
Defeat an enemy while hanging from a wall.
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Complete the first level without skipping any cutscenes.
Defeat the bloodthirsty girl.
Defeat a porcupine tank while it has its shield up.
Equip your first skill!
Explore the cave under the bed.
Use the bats as a flying bridge.
Use a teleport mirror to go back.
Hit a wolf key six times without touching the ground.
Unlock the swords.
Unlock the hunter armor.
Lose during the tutorial.