Kill first enemy
ACH_KILL_FIRST_ENEMY96.9%

Achievements and their recorded unlock rates.
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ACH_KILL_FIRST_ENEMYACH_COLLECT_100_TICKETSACH_GET_TO_FIRST_FLOORACH_FIND_SECRET_AREAACH_GET_GRAPPLEACH_GET_DASHACH_GET_BOUNCY_BOOTSACH_GET_DOUBLE_JUMPACH_BEAT_GAMEACH_MAX_FIRE_SPECIALTYACH_SLIDE_100_TIMESACH_COLLECT_2000_TICKETSACH_PLAY_ADVENTURE_PLUSACH_BEAT_GAME_UNDER_4_HOURSACH_MAX_ALL_WEAPONSACH_BEAT_ADVENTURE_PLUSACH_FIND_ALL_SECRETSACH_BEAT_WITHOUT_DYING