Here is the full list of all 34 The Book of Unwritten Tales: The Critter Chronicles achievements.
Finish the fifth chapter in hard mode.
Finish the fourth chapter in hard mode.
Finish the third chapter in hard mode.
Make the baby critter fly 3 times.
Finish the second chapter in hard mode.
Finish the first chapter in hard mode.
Find out the machinists dirty little secret.
Hit the penguin 3 times.
Finish the fifth chapter in normal mode.
Find the best disguise for Critter to enter the sanctuary.
Let Critter wear every available costume part simultaneously.
Finish the fourth chapter in normal mode.
Let Critter fly 3 times.
Try to climb the tricky stairs 3 times.
Paint the picture correctly at the first try.
Manipulate the pictures to empty a frame.
Slide down the tricky stairs 3 times.
Catch Ma'Zaz in a trap.
Look at all the outfits in the wardrobe.
Finish the third chapter in normal mode.
Join the Black Guards.
Make a penguin cocktail.
Convince Cornelius to lock himself up.
Scare Petra away.
Click stuff 1000 times.
Finish the second chapter in normal mode.
Show Layla the stars.
Break the conveyor belt.
Distract the critter cook.
Disguise as a lamp 3 times.
Finish the first chapter in normal mode.
Annoy the orc bounty huntress.
Open the captains little chest.
Point at stuff 1000 times