Kill rat
ACH_KILL_RAT78.4%

Achievements and their recorded unlock rates.
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ACH_KILL_RATACH_KILL_SPIDERACH_FOUNTAINACH_KILL_BATACH_KILL_SNAKEACH_WISHACH_KILL_BOOMERACH_KILL_RED_SNAKEACH_KILL_RED_SPIDERACH_SACRIFICEACH_DEATH_POISONACH_KILL_GERGACH_KILL_SHOPKEEPERACH_DEATH_EXPLODEACH_KILL_SLIMEACH_KILL_PURPLE_SNAKEACH_KILL_IMPACH_KILL_BROWN_SLIMEACH_KILL_RED_SLIMEACH_KILL_EYEACH_KILL_HAMMER_GOBLINACH_REROLLACH_DEATH_LIGHTNINGACH_KILL_SKELETONACH_DEATH_FIREACH_KILL_YCNANACH_DEATH_FOODACH_KILL_RELLIMACH_DEATH_ARROWACH_DEATH_SPIKEACH_KILL_MINOTAURACH_DEATH_DARTACH_DEATH_FREEZE