First boss
FIRST_BOSS45.4%

Achievements and their recorded unlock rates.
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FIRST_BOSSA_HUNDRED_DESTROYEDFIRST_LEVEL_NO_DEATHTWO_HUNDRED_DESTROYEDSECOND_LEVEL_NO_DEATHLAST_BOSSFOURTH_LEVEL_NO_DEATHTHIRD_LEVEL_NO_DEATHFIFTH_LEVEL_NO_DEATHEND_GAME_NO_DEATH