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