So, this is MY personal save of PowerUp Heroes at lvl 9. Have the pleasure to find it.<br />
My save has 149170 xp of 150k xp needed for the achievement.<br />
I boosted against Shadow X (1400xp) using Chaos X and Scorch X in case you wanna know.<br />
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You only need to rematch against any X character, that should be enough xp for the achievement.<br />
I already had all achievements before boosting, so I don't know if the Campaign achievements will pop. Have it finished just to make it more legit.<br />
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Enjoy.