First furnace lit
FIRST_FURNACE_LIT94.7%

Achievements and their recorded unlock rates.
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FIRST_FURNACE_LITFIRST_PLUNGER_COLLECTEDFIRST_MAP_COLLECTEDDIVING_SUIT_COLLECTEDWRENCH_COLLECTEDFIRST_TREASURE_COLLECTEDSECOND_PLUNGER_COLLECTEDTHIRD_PLUNGER_COLLECTEDALL_MAPS_COLLECTEDTORCHES_LITENDING_B_REACHEDFOURTH_PLUNGER_COLLECTEDALL_TREASURES_COLLECTEDALL_FURNACES_LITPLATINUMENDING_A_REACHED