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