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