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