Here is the full list of all 47 BALAN WONDERWORLD achievements.
Complete Chapter Twelve
Complete Chapter Eleven
Catch a fleeing cast member
Collect fifty costumes
Complete Chapter Ten
Complete Chapter Nine
Complete Chapter Eight
Complete Chapter Seven
Complete Chapter Six
Populate the Isle of Tims with thirty Tims
Complete Chapter Five
Complete Chapter Four
Perform on a stage for the first time
Collect twenty costumes
Complete Chapter Three
Complete Chapter Two
Collect your first raindrop
Complete Chapter One
Defeat a Negate-guarding Negati for the first time
Unlock the Tower o' Tims
Feed a drop to a Tim for the first time
Play a round of Balan's Bout for the first time
Defeat a Negati for the first time
Collect your first Balan statue
Don a costume for the first time
Collect all achievements
Collect over one thousand drops in a single act
Collect every gold Balan statue
Collect every costume
Populate the Isle of Tims with one hundred Tims
Play every mini game in every chapter