Here is the full list of all 35 Little Nightmares II achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Your life is now free of challenges. Congratulations
Hold tight and we'll be just fine
Hats are very important to some people
You punctuated someone's day. Maybe they'll notice!
Nothing of us remains in the pale city
Nothing of us remains anywhere. Bravo!
It's crueller to let him live
Any other last requests?
Some holes are more picky than others
Nothing of us remains in the hospital
Movie night on the ward - all taken care of!
Better to be safe than sorry
There, you'll be much warmer now
I see through you...
Creative, efficient, brutal. Top of the class!
Rebellion at its finest!
Unorthodox, but they all count!
Nothing of us remains at the school
It's not murder if they're bad people... is it?
Nothing of us remains in the wilderness
It would be cliché to collect them all
What did you expect to see in there?
Not today!
Perfect! It's so... you!
It's all over now
Life in the big city is all over
Hello, have we met?
Are you sure you don't need any further... treatments?
Plenty of snacks for a growing boy
Best days of our short, terrible life
You never know when you need protection from the elements
My, what a curious song you play!
Tempting, so tempting...
Relax, she heard you!
Nature is a terrifying thing