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