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 the adventure in the cave with Arlo.
Accept Gust's proposal.
Complete Phyllis's Dream
Pass the trials set by Ginger's family.
Place first in five fishing competitions.
Propose to Emily in front of the Pumpkin Princess House.
Complete 150 Commerce Guild commissions.
You were at fault...
Accept the proposal from Mint.
Successfully make 30 different dishes.
Enjoy some fireworks with Dr. Xu.
Unlock all backpack slots.
Getting divorced.
Have or adopt a second child.
Place 5 advertisements in the Portia Times for the workshop.
Clear Level 100 of the Deepest Ruins.
Used all items from the Vending Machine in the Deepest Ruins.
Get to Level 50 of the Deepest Ruins without using Vending Machines.
Clear Level 50 of the Deepest Ruins.
Accumulatively give out 500 gifts.
Complete the main storyline.
Throw ten parties.
Meet Pa.
Achieve the relationship "Happy Child" with your kid.
Enter the Deepest Ruins.
Clear Level 10 of the Deepest Ruins.
Expand the land area of the workshop to the maximum.
Accumulated 10 times during the Doodles mini-game where the play date is happy with the result.
Defeat the rogue knight and All Source.
Getting caught by the Sky Shark Pirates.
Have or adopt a child.
Use 50 Fireworks in one setting.
Have maximum Stamina reach 600.
Gather 50 assembly diagrams.
Accumulated 10 times in the Swing mini-game where the play date is happy with the result.
Complete the new Portia Harbor.
Encounter the rogue knight.
Accumulated 10 meals during dates and play dates.
Completed 100 Inspections at the Commerce Guild.
You missed a date.
Throw a party.
Complete South Block.
Workshop reputation reaches Level S.
Play the seesaw and get your playmate to catch a bird.
Win the highest possible award in the Slots mini-game.
Recognize 5 different constellations.
Cumulatively picked up 500 feces.
Win 20 games of Rock Paper Scissors in 3-0 fashion.
Win at Cross Five 50 times.
Recover 15 different types of relics.
Be ranked number one in a seasonal workshop ranking.
Defeat 30 rare monsters.
Keep the spiciness of the hotpot above 85 for 10 seconds during the Winter Solstice festival.
Opening Of The Museum
Provide 100 Data Discs to the Church of the Light.
Find a diamond.
Get more than 40 Ghost Badges in Haunted Cave Exploration.
Achieve the best relationship with your spouse.
Help build the Portia Bridge.
Have maximum HP reach 2000.
Everyone likes you!
Adopt Scraps.
Try lasso roping for 50 times.
Defeated all the people that can spar in Portia.
Congratulations!
Help fix Ack the living AI.
Talk with other town folks over 500 times.
Clear all the levels in any Hazardous Ruins.
Get 300 items by kicking trees.
Help the Portia Tree Farm be operational again.
Adopt Pinky.
Accumulatively give out 50 gifts that people like.
Complete all five Dee-dee transport commissions.
Open 50 treasure chests.
Gain 150 points in the Dart game.
Provide 100 Data Discs to the Research Center.
Give out a gift that the other person doesn't like.
Find more than 10 Ghost Badges in a single Day of Memories event.
Did I just use the Blender to mix feces...?
Fail at cooking 1 time.
Finish with a over 90% accuracy rate in the Balloons mini-game.
Accumulate 10,000 Gols.
Forced to sleep at 3:00 in the morning.
Cut down 200 trees.
Pass the test to enter the Collapsed Wasteland.
The first photo taken with someone else.
Pick up 7 gifts during the Day of the Bright Sun event.
Discover a mysterious room in Abandoned Ruins.
Enter the Abandoned Ruins for the first time.
Register your workshop.
Arrive at Portia.