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