First kill
first_kill97.1%

Achievements and their recorded unlock rates.
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first_killsurvivor_5survivor_10survivor_40devourer_slainlow_health_heroleveled_upsaucer_slainboss_saucer_slainseeker_slainarmored_slaincomet_slainricochet_slainsplinter_slainmothership_slainfully_upgradedworm_slain