Triumph for defeating bosses in new Onslaught mode requires 50 of the wave 50 bosses to be killed for 100% completion, essentially Onslaught: Salvation. Seems a bit overkill for something that only required 4 last time we saw Onslaught? The Wave 10 playlist boss doesn't count since it only cares for the Onslaught: Salvation playlist.
fallen seasons getting crazy triumph requirements yet again :(
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Now that's a triumph.