Here is the full list of all 91 My Time At Portia achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Completed 100 Inspections at the Commerce Guild.
Cumulatively picked up 500 feces.
Workshop reputation reaches Level S.
Complete 150 Commerce Guild commissions.
Successfully make 30 different dishes.
Get 300 items by kicking trees.
Place 5 advertisements in the Portia Times for the workshop.
Have maximum Stamina reach 600.
Defeated all the people that can spar in Portia.
Defeat 30 rare monsters.
Congratulations!
Getting divorced.
You were at fault...
Everyone likes you!
Accumulatively give out 500 gifts.
Play the seesaw and get your playmate to catch a bird.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Recognize 5 different constellations.
Accept the proposal from Mint.
Accept Gust's proposal.
Pass the trials set by Ginger's family.
Complete Phyllis's Dream
Place first in five fishing competitions.
Propose to Emily in front of the Pumpkin Princess House.
Enjoy some fireworks with Dr. Xu.
Complete the adventure in the cave with Arlo.
Achieve the best relationship with your spouse.
Have or adopt a child.
Have or adopt a second child.
Achieve the relationship "Happy Child" with your kid.
Throw a party.
Throw ten parties.
Talk with other town folks over 500 times.
Clear Level 100 of the Deepest Ruins.
Have maximum HP reach 2000.
Used all items from the Vending Machine in the Deepest Ruins.
Complete the main storyline.
Complete all five Dee-dee transport commissions.
Try lasso roping for 50 times.
Win at Cross Five 50 times.
Accumulated 10 meals during dates and play dates.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Find more than 10 Ghost Badges in a single Day of Memories event.
Get to Level 50 of the Deepest Ruins without using Vending Machines.
Clear Level 50 of the Deepest Ruins.
Clear Level 10 of the Deepest Ruins.
Enter the Deepest Ruins.
Did I just use the Blender to mix feces...?
Meet Pa.
Adopt Scraps.
Adopt Pinky.
Be ranked number one in a seasonal workshop ranking.
Defeat the rogue knight and All Source.
Getting caught by the Sky Shark Pirates.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Recover 15 different types of relics.
Use 50 Fireworks in one setting.
Encounter the rogue knight.
Gather 50 assembly diagrams.
Complete the new Portia Harbor.
You missed a date.
Complete South Block.
Accumulatively give out 50 gifts that people like.
Provide 100 Data Discs to the Church of the Light.
Win the highest possible award in the Slots mini-game.
Gain 150 points in the Dart game.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Find a diamond.
Help build the Portia Bridge.
Opening Of The Museum
Help fix Ack the living AI.
Help the Portia Tree Farm be operational again.
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Clear all the levels in any Hazardous Ruins.
Open 50 treasure chests.
Provide 100 Data Discs to the Research Center.
Accumulate 10,000 Gols.
Cut down 200 trees.
Fail at cooking 1 time.
Unlock all backpack slots.
Expand the land area of the workshop to the maximum.
Pass the test to enter the Collapsed Wasteland.
Give out a gift that the other person doesn't like.
The first photo taken with someone else.
Pick up 7 gifts during the Day of the Bright Sun event.
Forced to sleep at 3:00 in the morning.
Discover a mysterious room in Abandoned Ruins.
Enter the Abandoned Ruins for the first time.
Register your workshop.
Arrive at Portia.