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