Kill100
Kill10075.5%

Achievements and their recorded unlock rates.
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Kill10050KillstreakAttachment5100KillstreakKill1000Attachment10200Killstreak10SpecialFirstLife300KillstreakAttachment15500KillstreakAttachment20Attachment25Kill10000800KillstreakAttachment30Attachment35RepeatCustomerAttachment40100SpecialAttachment50EarthSavedHunterKilledDebrisBossCruiserKilledDestroyerSavedAttachment100ObocSavedKill100000AngryReloader1000SpecialBeatMinefieldAttachment200KilledEyeDefenderOfEarthAttachment300Attachment400ProtoCruiserSavedSomethingFishyKill1000000