01 clearupperlayer
ACH_01_ClearUpperLayer56.7%

Achievements and their recorded unlock rates.
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ACH_01_ClearUpperLayerACH_06_Medjed'sAlmsACH_05_MedjedKillACH_02_ClearLowerLayerACH_04_TreasureMapACH_03_ArrestACH_08_FoundACH_09_UnknownACH_07_10LeversACH_10_TreasureHunter