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