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