Craft amethyst pickaxe
ACH_CRAFT_AMETHYST_PICKAXE75.5%

Achievements and their recorded unlock rates.
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ACH_CRAFT_AMETHYST_PICKAXEACH_CRAFT_EMERALD_PICKAXEACH_CRAFT_SAPPHIRE_PICKAXEACH_CRAFT_RUBY_PICKAXEACH_CRAFT_DIAMOND_PICKAXEACH_STONE_BIOMEACH_HALF_LIFEACH_OBSIDIAN_BIOMEACH_DWARVES_ASSEMBLEACH_MAX_LEVELACH_LAVA_BIOMEACH_REACH_COREACH_GIMLIACH_DESTROY_COREACH_FISH