Pancake butt
PANCAKE_BUTT68.5%

Achievements and their recorded unlock rates.
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PANCAKE_BUTTAVERAGE_CABOOSEHOME_GYMONE_MONTH_TRIALROCK_HARD_BOTTOMCARDIO_CASUALBUNS_OF_STEELGYM_RATGOLDEN_GLUTEUSLEG_DAY_EVERY_DAYNO_FUNONLY_PAINPURE_GAINSKING_OF_THE_GYMGUARDIAN_OF_THE_GYM