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