Underworld achievement
UNDERWORLD_ACHIEVEMENT94.3%

Achievements and their recorded unlock rates.
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UNDERWORLD_ACHIEVEMENTHELLCLIFFS_ACHIEVEMENTTHECARRACE_ACHIEVEMENTTHEMYSTERIOUSCAVE_ACHIEVEMENTTHESUBWAYSTATION_ACHIEVEMENTTHECITY_ACHIEVEMENTOVERTHEBUILDINGS_ACHIEVEMENTTHEWAREHOUSE_ACHIEVEMENTTHEHARBOR_ACHIEVEMENTTHETEMPLE_ACHIEVEMENTTHEASIANSHRINE_ACHIEVEMENTTHEDEITIES_ACHIEVEMENTTHEGARDEN_ACHIEVEMENTWINGS_ACHIEVEMENTTIME_ACHIEVEMENTLAVA_ACHIEVEMENT