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.
Complete Phyllis's Dream
Accept the proposal from Mint.
Accept Gust's proposal.
Pass the trials set by Ginger's family.
Complete the adventure in the cave with Arlo.
Getting divorced.
Have or adopt a second child.
Achieve the relationship "Happy Child" with your kid.
Have or adopt a child.
Complete 150 Commerce Guild commissions.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Achieve the best relationship with your spouse.
Congratulations!
Propose to Emily in front of the Pumpkin Princess House.
Workshop reputation reaches Level S.
Accumulated 10 meals during dates and play dates.
Everyone likes you!
Complete the main storyline.
Meet Pa.
Clear Level 100 of the Deepest Ruins.
Completed 100 Inspections at the Commerce Guild.
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.
Clear Level 10 of the Deepest Ruins.
Enter the Deepest Ruins.
Throw ten parties.
Expand the land area of the workshop to the maximum.
Defeat the rogue knight and All Source.
Getting caught by the Sky Shark Pirates.
Have maximum Stamina reach 600.
Enjoy some fireworks with Dr. Xu.
Defeat 30 rare monsters.
Have maximum HP reach 2000.
You were at fault...
Successfully make 30 different dishes.
Cumulatively picked up 500 feces.
Place first in five fishing competitions.
Encounter the rogue knight.
Gather 50 assembly diagrams.
Complete the new Portia Harbor.
Recover 15 different types of relics.
Be ranked number one in a seasonal workshop ranking.
Accumulatively give out 500 gifts.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Talk with other town folks over 500 times.
Unlock all backpack slots.
Throw a party.
Complete South Block.
Provide 100 Data Discs to the Church of the Light.
Recognize 5 different constellations.
Place 5 advertisements in the Portia Times for the workshop.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Adopt Scraps.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Find a diamond.
Help build the Portia Bridge.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Use 50 Fireworks in one setting.
Win the highest possible award in the Slots mini-game.
Gain 150 points in the Dart game.
Provide 100 Data Discs to the Research Center.
Opening Of The Museum
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Adopt Pinky.
Accumulatively give out 50 gifts that people like.
Play the seesaw and get your playmate to catch a bird.
Win at Cross Five 50 times.
Clear all the levels in any Hazardous Ruins.
You missed a date.
Find more than 10 Ghost Badges in a single Day of Memories event.
Defeated all the people that can spar in Portia.
Help fix Ack the living AI.
The first photo taken with someone else.
Help the Portia Tree Farm be operational again.
Fail at cooking 1 time.
Did I just use the Blender to mix feces...?
Try lasso roping for 50 times.
Get 300 items by kicking trees.
Open 50 treasure chests.
Give out a gift that the other person doesn't like.
Complete all five Dee-dee transport commissions.
Cut down 200 trees.
Accumulate 10,000 Gols.
Pick up 7 gifts during the Day of the Bright Sun event.
Pass the test to enter the Collapsed Wasteland.
Discover a mysterious room in Abandoned Ruins.
Forced to sleep at 3:00 in the morning.
Enter the Abandoned Ruins for the first time.
Register your workshop.
Arrive at Portia.