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