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.
Pass the trials set by Ginger's family.
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.
Complete Phyllis's Dream
You were at fault...
Accept Gust's proposal.
Enjoy some fireworks with Dr. Xu.
Recognize 5 different constellations.
Getting divorced.
Complete 150 Commerce Guild commissions.
Successfully make 30 different dishes.
Throw ten parties.
Place first in five fishing competitions.
Have maximum Stamina reach 600.
Clear Level 100 of the Deepest Ruins.
Accumulatively give out 500 gifts.
Used all items from the Vending Machine in the Deepest Ruins.
Place 5 advertisements in the Portia Times for the workshop.
Recover 15 different types of relics.
Have or adopt a second child.
Accumulated 10 meals during dates and play dates.
Achieve the relationship "Happy Child" with your kid.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Complete the main storyline.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Cumulatively picked up 500 feces.
Have or adopt a child.
Play the seesaw and get your playmate to catch a bird.
Expand the land area of the workshop to the maximum.
Get 300 items by kicking trees.
Use 50 Fireworks in one setting.
Defeated all the people that can spar in Portia.
Try lasso roping for 50 times.
Meet Pa.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Have maximum HP reach 2000.
Give out a gift that the other person doesn't like.
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.
Everyone likes you!
Defeat 30 rare monsters.
Defeat the rogue knight and All Source.
Getting caught by the Sky Shark Pirates.
Throw a party.
Provide 100 Data Discs to the Church of the Light.
Unlock all backpack slots.
Fail at cooking 1 time.
Gather 50 assembly diagrams.
Encounter the rogue knight.
Complete the new Portia Harbor.
You missed a date.
Workshop reputation reaches Level S.
Win at Cross Five 50 times.
Complete South Block.
Be ranked number one in a seasonal workshop ranking.
Completed 100 Inspections at the Commerce Guild.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Clear all the levels in any Hazardous Ruins.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Find a diamond.
Complete the adventure in the cave with Arlo.
Help build the Portia Bridge.
Opening Of The Museum
Achieve the best relationship with your spouse.
Provide 100 Data Discs to the Research Center.
Win the highest possible award in the Slots mini-game.
Help the Portia Tree Farm be operational again.
Congratulations!
Help fix Ack the living AI.
Open 50 treasure chests.
Adopt Scraps.
Talk with other town folks over 500 times.
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Did I just use the Blender to mix feces...?
Accumulatively give out 50 gifts that people like.
Gain 150 points in the Dart game.
Adopt Pinky.
Complete all five Dee-dee transport commissions.
Cut down 200 trees.
Pass the test to enter the Collapsed Wasteland.
Accumulate 10,000 Gols.
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.
Discover a mysterious room in Abandoned Ruins.
Enter the Abandoned Ruins for the first time.
Register your workshop.
Arrive at Portia.