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