Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Bookworm	Collect all the lost archives.
Easier than Rubik's Cube	Finish all the secret levels in hardcore mode.
Explorer	Finish all the levels in the Ice Remnants.
Factory City inspector	Finish all the levels in the Lanternium in hardcore mode.
Hail to the Savior!	Finish all the levels in the Lanternium.
Isn't it a sushi restaurant?	Finish all the levels in the Angler's Den.
Outstanding brain!	Finish all the secret levels.
Raccoon Jones	Finish all the levels in the Ice remnants in hardcore mode.
The abandoned castle	Finish all the levels in the Angler's Den in hardcore mode.