"Berserker Barrage" and "Hyakuretsu Kyaku" achievement hint
Start a Versus mode match and have player one select Iron Man three times while player two selects Dan three times. At the start of the match, each player must build up their special gauges to at least 3 by punching or kicking the air. After both players have done this, have the Dan team execute a level 3 Hyper Combo (LB + RB) followed immediately by the Iron Man team's level 3 Hyper Combo. The Dan team should be blasted well over 200 hits, resulting in the "Hyakuretsu Kyaku" and "Berserker Barrage" achievements being unlocked.