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In order to get the grim synergy achievement in Castlevania Harmony of Despair, you will need to kill a boss in co-op using dual crush. This is easiest to obtain on the first level after you get Gergoth to break through the bridge, he’ll need to be attacked a bit more before you use dual crush, just before Gergoth is about to die stand next to your co-op partner and both of you need to pull the right trigger.

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