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