MediumConfidence: 0.88
Coliseum Regular
Conquered 5 Coliseum tournaments.
Global unlock
39.0%
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What to do next
SourceThe Coliseum opens up in Kamurocho from Chapter 8 onward, after Majima's Chapter 7 challenge.
Clear any 5 of the 9 total tournaments — you don't need all of them for this achievement (only for the Amon fight later).