Very heavy
ACH_VERY_HEAVY28.9%

Achievements and their recorded unlock rates.
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ACH_VERY_HEAVYACH_FUEL_LIMITACH_METEOR_RAINACH_BLUE_STARACH_BIG_COLLAPSEACH_BIG_IMPACTACH_SHINE_LIKE_CRYSTALACH_BIG_MOONACH_RED_STARACH_YELLOW_STARACH_GREEN_STARACH_SECRET_DISCOVERYACH_TOO_HOTACH_ESCAPE