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