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