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