First time losing
ACH_FIRST_TIME_LOSING6.4%

Achievements and their recorded unlock rates.
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ACH_FIRST_TIME_LOSINGACH_KILL_30ACH_FIRST_WAVEACH_KILL_100ACH_SHOTGUN_ACQUIREDACH_KILL_1KACH_BARREL_KILLSACH_FREEZE_200_ZOMBIESACH_CLOSE_100_DOORSACH_SURVIVE_30_WAVESACH_SNIPER_ACQUIREDACH_GATLING_ACQUIREDACH_ROCKET_ACQUIREDACH_PLACE_500_HANDGUNSACH_PLACE_999_GUARDSACH_ALL_SCIENTISTS_ALIVE_AT_10ACH_REACH_3K_SUPPLIESACH_PLACE_500_RIFLESACH_REPAIR_30_DOORS