Here is the full list of all 14 INSIDE achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Hanging up
Shadows at noon
Safe falling and hard landings
Unearthing secrets
Something’s not right down here
They never made it to market
Lies beneath the city
Dislodging derelict in the depths
Skipping stones at the beach
Pull together
Dive back in
Take a deep breath
Do an elevator pitch
It comes together