Here is the full list of all 21 LEGO Bricktales achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Buy all items from the Ghost's shops in all worlds.
Complete 100% of the worlds.
Find all treasure chests in the Caribbean world.
Find all treasure chests in the City world.
Find all treasure chests in the Medieval world.
Collect all rabbits.
Collect all blue birds.
Smash all destroyables.
Find all treasure chests in the Desert world.
Find all treasure chests in the Jungle world.
Collect all chameleons.
Collect all hermit crabs.
Collect all ladybugs.
Collect the Happiness Crystal from the Caribbean world.
Collect the Happiness Crystal from the City world.
Collect the Happiness Crystal from the Medieval world.
Produce at least one simulation fail after the tutorial.
Collect the Happiness Crystal from the Desert world.
Collect the Happiness Crystal from the Jungle world.
Use your first brick from the sandbox.
Change your look in the wardrobe at least once.