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