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