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
Hats are very important to some people
Hold tight and we'll be just fine
You punctuated someone's day. Maybe they'll notice!
Hello, have we met?
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!
There, you'll be much warmer now
Plenty of snacks for a growing boy
My, what a curious song you play!
Nothing of us remains at the school
Tempting, so tempting...
Creative, efficient, brutal. Top of the class!
Rebellion at its finest!
Unorthodox, but they all count!
Nothing of us remains in the wilderness
Relax, she heard you!
Not today!
Perfect! It's so... you!
It's all over now
Life in the big city is all over
It would be cliché to collect them all
Are you sure you don't need any further... treatments?
Better to be safe than sorry
I see through you...
Best days of our short, terrible life
You never know when you need protection from the elements
Nature is a terrifying thing
It's not murder if they're bad people... is it?
What did you expect to see in there?