Here is the full list of all 25 Unpacking achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Found a head to wear the hat.
Flushed every toilet.
Set the time on the microwave.
Turned on a game console.
Rescued a forgotten poster.
Placed all the coffee-making equipment on the counter.
Unpacked 2018.
Built a tower out of baby blocks.
Unpacked 2015.
Found a place for every plant.
Put the tiger and pig side by side.
Unpacked 2013.
Wrote an equation with fridge magnets.
Unpacked 2012.
Unpacked 2010.
Turned on a music player.
Tidied up his underwear drawer.
Unpacked 2007.
Unpacked 2004.
Put the cookie jar out of reach.
Put an electronic item somewhere dangerous.
Made the mannequin dab.
Unpacked 1997.
Solved the cube.
Found your camera.