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