Here is the full list of all 35 80 Days achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Become an American boxing champion
Completed trip in 50 days or less
Save an Artificer and her device from falling into the wrong hands
Descend into the heart of the earth itself
Travelled across the northern wastes aboard the Floating Reservation
Travelled all the way around the world without using a hotel
Spend the night in Machu Picchu
Find true love waiting for you on your return to London
Travelled over 239,000 miles in total
Betray a living being to the Didacian nuns
Walk the ocean floor
Reignite love in the frozen north
Visit the secret observatory of Mount Elbrus
Become intimate with an airship
File a news story in the Times
Travelled all the way around the world without using a bank
Launch for the Moon!
Embark on a life of crime in the company of the world's greatest jewel thief
Enter the secret vault of the Artificers
Ruin the life of a man of Vienna
Aid the Belgrade resistance
Have Monsieur Fogg die
Travel beneath the ocean waves with a certain infamous Captain
Completed trip in 70 days or less
Completed trip in 60 days or less
Completed trip in 80 days or less
Bring a murderer to justice using your powers of deduction
Rescue a man from hanging
Visited the World's Fair in Paris
Visited at least 20 cities in a single trip
Visited at least 30 cities in a single trip
Travelled all the way around the world
Knock out Jesse James
Completed trip in 40 days or less
Go over Niagara Falls!