Here is the full list of all 34 The Book of Unwritten Tales: The Critter Chronicles achievements.
Hit the penguin 3 times.
Finish the fifth chapter in normal mode.
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.
Finish the third chapter in normal mode.
Find out the machinists dirty little secret.
Make the baby critter fly 3 times.
Finish the second chapter in normal mode.
Finish the first chapter in normal mode.
Finish the fifth chapter in hard mode.
Find the best disguise for Critter to enter the sanctuary.
Finish the fourth chapter in hard mode.
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.
Finish the third chapter in hard mode.
Convince Cornelius to lock himself up.
Join the Black Guards.
Make a penguin cocktail.
Scare Petra away.
Finish the second chapter in hard mode.
Show Layla the stars.
Disguise as a lamp 3 times.
Break the conveyor belt.
Distract the critter cook.
Click stuff 1000 times.
Finish the first chapter in hard mode.
Annoy the orc bounty huntress.
Point at stuff 1000 times
Open the captains little chest.
Look at all the outfits in the wardrobe.