Arc skill octuple
ARC_SKILL_OCTUPLE56.5%

Achievements and their recorded unlock rates.
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ARC_SKILL_OCTUPLEARC_REACH_02ARC_SUPERBOLT_01ARC_NODES_1KARC_STORM_01ARC_SCAR_50ARC_REACH_03ARC_SKILL_CHAINARC_NODES_10KARC_LEAKARC_REACH_04ARC_CROSS_5MARC_SKILL_RUPTURE_10ARC_COLLAPSE_01ARC_REACH_05ARC_STAR_05ARC_REACH_06ARC_SKILL_SURGE_BURSTARC_CHARGE_1BARC_SKILL_ALIGNEDARC_ION_1KARC_REACH_07ARC_OFFLINEARC_STAR_15ARC_END_01ARC_START_03ARC_SKILL_RUPTURE_100ARC_PERK_10ARC_END_02ARC_BRANCH_01ARC_SPEED_45ARC_BRANCH_02ARC_ION_100KARC_COLLAPSE_05ARC_TIME_05HARC_SKILL_RESONANCEARC_TITLEARC_CHAL_GLASSARC_SKILL_BAREHANDARC_CHAL_SILENCEARC_CHAL_NIGHTARC_PERK_ALLARC_CHAL_MONOCHORDARC_CHAL_GREEDARC_COLLAPSE_15ARC_BRANCH_03ARC_STAR_ALL