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