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