Here is the full list of all 84 OMORI achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Commission all of GATOR GUY's statues.
Unlock all achievements. Thank you for playing OMORI.
Get all rewards from the RECYCLING MACHINE.
Defeat 100 SQUIZZARDS.
Watch all movies in SWEETHEART'S "throne room".
Complete the FOE FACTS! journal.
Recover at all of MARI's picnics.
Pet all the creatures in MARINA's sector in HUMPHREY.
Defeat the RECYCLEPATH.
Defeat the HOOLIGANS with PEPPER SPRAY.
Defeat the PET ROCK champion.
Defeat 100 BUNNIES.
Defeat ???.
Fly the BUTT CERTIFICATE in CATTAIL FIELD.
Read all the tombstones in the... dev room...
Complete the math worksheet correctly.
Complete the grammar worksheet correctly.
Complete all part-time jobs once.
Get a perfect score delivering PIZZA.
Quit in the middle of a part-time job.
Lose to KIM and VANCE.
Commission all of ROCOCO's art.
Brush your teeth every day.
Battle the "bees".
Insert every song into GINO'S JUKEBOX.
Feed the STRAY CAT every day and sunset.
Go to SEAN and KAREN's housewarming party.
Receive all FLOWERS in the hospital.
Visit all mirrors.
Look through all telescopes.
Defeat PLUTO and THE EARTH.
Choose the WINTER MOLE.
Choose the FALL MOLE.
Choose the SUMMER MOLE.
Choose the SPRING MOLE.
Defeat every SOMETHING at the bottom of the LOST LIBRARY.
Hold 99 TOFU.
Throw away something.
Beat the BOSS RUSH.
Defeat PERFECTHEART.
Have a ghost party.
Get the LOL SWORD.
Take the KEEPER OF THE CASTLE's power.
Commission ROCOCO.
Defeat SPACE EX-HUSBAND.
Let the plastic fish finish its song.
Defeat MUTANTHEART.
Defeat ROBOHEART.
Get the FLOWER CROWN from BASIL.
Trade CLAMS for CLEMS.
Complete your TO-DO LIST.
Complete ORANGE JOE's quest.
Defeat UNBREAD TWINS.
Don't high-five KEL.
Listen to MR. SCARETHROW's rant.
Gain BREAD using BREAD SLICE.
Reach the other ending.
Take $20.00 from KEL's wardrobe.
Give FLOWERS to MARI.
Make your way and talk to LONE MOLE.
Pet a dog.
Enter code: haveadollariguess at www.omocat-shop.com for $1.00 off.
Reach the bad ending.
Reach the good ending.
High-five KEL three times.
Defeat HUMPHREY.
Defeat SLIME GIRLS.
Water a plant back to life in BASIL's garden.
Defeat MR. JAWSUM.
Defeat PLUTO (EXPANDED).
Defeat SWEETHEART.
Perfectly train the SPROUT MOLE choir.
Kill the first SOUS CHEF.
Ruin Christmas.
RELEASE ENERGY on your foes.
Defeat KITE KID.
Turn the valve to the right in RAIN TOWN.
Go to sleep after a long day.
High-five KEL.
Wake up in the morning.
Defeat SPACE EX-BOYFRIEND.
Defeat DOWNLOAD WINDOW.
Defeat THE EARTH.
Defeat the CHICKEN? at the top of DINO'S DIG.