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To help Blizzardstep you need to talk to him, give Hollybreeze the flower, talk to Blizzardstep again and then talk to Hollybreeze´s brother, talk to Blizzardstep again, the other one I don´t know

For Nightlight cheating, you have to talk to Moose a few times, then once he asks you to do him a favor, say yes, and then give Nightlight a pink tulip. Talk to Moose after she's done talking then talk to her again, say yes to her question then go talk to Sleetshine. Once you're done with that, go talk to Nightlight, she'll tell you to talk to Moose, talk to him, then you get the acheivment.