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 City world.
Collect all blue birds.
Collect all rabbits.
Find all treasure chests in the Medieval world.
Collect all chameleons.
Smash all destroyables.
Collect all hermit crabs.
Use your first brick from the sandbox.
Find all treasure chests in the Caribbean world.
Collect all ladybugs.
Find all treasure chests in the Desert world.
Find all treasure chests in the Jungle world.
Collect the Happiness Crystal from the Caribbean world.
Collect the Happiness Crystal from the City world.
Collect the Happiness Crystal from the Medieval world.
Collect the Happiness Crystal from the Desert world.
Collect the Happiness Crystal from the Jungle world.
Produce at least one simulation fail after the tutorial.
Change your look in the wardrobe at least once.