Firstblood
ACH_FIRSTBLOOD63.8%

Achievements and their recorded unlock rates.
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ACH_FIRSTBLOODACH_BIGNUMBERSACH_CLOSECALLACH_KEENEYEACH_ESCAPEACH_WOLFWHISPERERACH_WELLWORNACH_RAGEFACTORYACH_BUTTERFINGERSACH_LETSKICKSOMEICEACH_PACIFIST