Here is the full list of all 11 The Wonderful End of the World achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Explicitly reset the game, then complete the entire thing in one sitting.
Steal the brontosaurus in Bumble Burbs.
Steal the Orangutan in the Bibliodiscotheque.
Obtain 12 A+ grades.
Grab a massive 10,000 or more objects.
Complete the Megalopolis level.
Steal a donut in the Bibliodiscotheque.
Steal a clipper ship in Rice Cake Parade.
Devour half the world by finishing 6 of the 12 levels.
Grab 2,500 or more objects.
Grab 500 or more objects.