Here is the full list of all 30 Chasing Tails ~A Promise in the Snow~ achievements.
Get all endings
Get max Kumi Points
Learn Kumi's secret
Let's hope this is completely different!
Survive the woods
Kumi is very happy (。・ω・。)
Get max Rin Points
Learn June's secret
Go for the tail!
Take part in a spontaneous eating show
Learn Rin's secret
Survive the bathtub scene
Just pick both next time!
Well, that's unfortunate
It's more likely than you think!
Survive the window scene
For real though, it's bad for your health!
Meet your new neighbor in person
You've earned it. Slow clapping.
That's a lotta cringe!
What a strange dream. You should probably start taking magnesium!
You lived, you fought and you suffered for your love
You did it! Phew~