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