Kills one
ACH_KILLS_ONE71.8%

Achievements and their recorded unlock rates.
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ACH_KILLS_ONEACH_SLOW_MO_CLEAR_ONEACH_KILLS_TWOACH_MELEE_KILLS_ONEACH_TWO_PLAYER_OPERATIONACH_SELF_REVIVEACH_SLIDE_BREACH_KILLACH_KILLS_THREEACH_HIGH_HEALTHACH_DAILY_OPERATIONACH_REMOVE_MASKS_ONEACH_COMPLETE_CASES_ONEACH_LOCKDOWN_ONEACH_EXPLOSION_KILLS_ONEACH_DAILY_TRAININGACH_LEVEL_ONEACH_REVIVE_OTHERACH_UNLOCK_ALL_WEAPONSACH_MULTI_TYPE_KILLS_ONEACH_LOCKDOWN_TWOACH_COMPLETE_HARD_CASES_ONE