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