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.
Have or adopt a second child.
Achieve the relationship "Happy Child" with your kid.
Getting divorced.
Have or adopt a child.
Achieve the best relationship with your spouse.
Propose to Emily in front of the Pumpkin Princess House.
Complete all five Dee-dee transport commissions.
Pass the trials set by Ginger's family.
Throw ten parties.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Recognize 5 different constellations.
You were at fault...
Congratulations!
Complete Phyllis's Dream
Defeated all the people that can spar in Portia.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Win at Cross Five 50 times.
Accumulated 10 meals during dates and play dates.
Gather 50 assembly diagrams.
Complete the adventure in the cave with Arlo.
Place 5 advertisements in the Portia Times for the workshop.
Accept Gust's proposal.
Try lasso roping for 50 times.
Find more than 10 Ghost Badges in a single Day of Memories event.
Successfully make 30 different dishes.
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Complete 150 Commerce Guild commissions.
Throw a party.
Place first in five fishing competitions.
Clear Level 100 of the Deepest Ruins.
Used all items from the Vending Machine in the Deepest Ruins.
Complete the main storyline.
Meet Pa.
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.
Enjoy some fireworks with Dr. Xu.
Encounter the rogue knight.
You missed a date.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Play the seesaw and get your playmate to catch a bird.
Use 50 Fireworks in one setting.
Cumulatively picked up 500 feces.
Adopt Scraps.
Provide 100 Data Discs to the Research Center.
Everyone likes you!
Defeat 30 rare monsters.
Pick up 7 gifts during the Day of the Bright Sun event.
Expand the land area of the workshop to the maximum.
Accumulatively give out 500 gifts.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Have maximum HP reach 2000.
Have maximum Stamina reach 600.
Completed 100 Inspections at the Commerce Guild.
Recover 15 different types of relics.
Complete the new Portia Harbor.
Give out a gift that the other person doesn't like.
Talk with other town folks over 500 times.
Get 300 items by kicking trees.
Clear all the levels in any Hazardous Ruins.
Workshop reputation reaches Level S.
Accumulatively give out 50 gifts that people like.
Adopt Pinky.
Open 50 treasure chests.
Cut down 200 trees.
Discover a mysterious room in Abandoned Ruins.
Provide 100 Data Discs to the Church of the Light.
Complete South Block.
Did I just use the Blender to mix feces...?
Unlock all backpack slots.
Find a diamond.
Be ranked number one in a seasonal workshop ranking.
The first photo taken with someone else.
Accumulate 10,000 Gols.
Win the highest possible award in the Slots mini-game.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Gain 150 points in the Dart game.
Forced to sleep at 3:00 in the morning.
Fail at cooking 1 time.
Enter the Abandoned Ruins for the first time.
Arrive at Portia.
Register your workshop.
Pass the test to enter the Collapsed Wasteland.
Help the Portia Tree Farm be operational again.
Help fix Ack the living AI.
Help build the Portia Bridge.
Opening Of The Museum