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