Challenge bug "heal plz" stopping me from getting the challenge accepted trophy

So I spent the past few days completing all of the challenges for the challenge accepted achievement and was 1 off from getting it. It was the “Say watt again?” challenge, as it was bugged in the minuses. I fixed it but then now I’ve got another bugged challenge to heal 2.1Billion hp, to get it reset again. Is there anyway of doing this or fixing this the fastest way as it’s all I need and it’s really frustrating