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