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