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