S01 complete
ACH_S01_COMPLETE62.6%

Achievements and their recorded unlock rates.
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ACH_S01_COMPLETEACH_TUT_COMPLETEACH_MMARC_SPEC_S1ACH_GEN_KILLCOUNTAACH_MMBRU_NOUPGRADESACH_S02_COMPLETEACH_S03_COMPLETEACH_MMBRU_NOCHARGEACH_MMARC_SPEC_S3ACH_GEN_COLL_ORBSACH_S04_COMPLETEACH_GEN_KILLCOUNTBACH_MM_NODMG_SACH_MMARC_ALLENEMIESACH_ARC_BOMBSACH_S05_COMPLETEACH_GEN_COLL_ITEMSACH_S06_COMPLETEACH_ARC_COMRADESACH_GEN_KILLCOUNTCACH_ARC_MAXMULTIACH_MMARC_INFRONTACH_MM_SCOREACH_BRU_FINISHACH_MMARC_SPEC_S2ACH_ARC_RATING_LOWACH_MMARC_NOSHOOTINGACH_MMARC_SPEC_S4ACH_MMARC_SPEC_S6ACH_ARC_ALLSTAGESACH_ARC_RATING_MEDACH_MM_NOORBSACH_GEN_BLOCKBULLETSACH_BRU_TIMEACH_ARC_RATING_HIGHACH_GEN_CREDITSACH_BRU_NODMGACH_MMARC_SPEC_S5ACH_MM_NODMG_CACH_GEN_PERFECT