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.
Change your look in the wardrobe at least once.
Use your first brick from the sandbox.
Produce at least one simulation fail after the tutorial.
Collect the Happiness Crystal from the Jungle world.
Collect the Happiness Crystal from the Desert world.
Collect the Happiness Crystal from the Medieval world.
Collect the Happiness Crystal from the City world.
Collect the Happiness Crystal from the Caribbean world.
Find all treasure chests in the Jungle world.
Find all treasure chests in the Desert world.
Find all treasure chests in the Medieval world.
Find all treasure chests in the City world.
Find all treasure chests in the Caribbean world.
Collect all chameleons.
Collect all ladybugs.
Collect all rabbits.
Collect all blue birds.
Collect all hermit crabs.
Complete 100% of the worlds.
Buy all items from the Ghost's shops in all worlds.
Smash all destroyables.