Here is the full list of all 40 The Forgotten City achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Reach the best ending with the smallest number of loops
Talk your way through every possible confrontation
Finish the game without looping through time once
Lie 10 times
Free the captive and shoot her captor with your gun
Enter the upper cistern in an unconventional way
Topple 10 peeled statues by kicking others into them
Die from hornet stings
Skip the city tour
Intimidate the creator of The Golden Rule
Dodge 3 boulders
Trigger The Golden Rule by stealing 5 times
Loop through time ten times
Allow Fabia to die in the collapsing temple
Reach Ending 3 of 4
Steal 2000 coins after the Golden Rule is broken
Reach Ending 1 of 4
Reach Ending 2 of 4
Find all three missing persons
Reach Ending 4 of 4
Assemble as many people as possible in the Museum
Confront the creator of The Golden Rule
Have Duli released from his cell
Help Galerius romance Equitia
Save Ulpius's life
Solve Vergil's problem
Find treasure using the golden bow
Read 10 different grafitti
Survive the Palace
Gild your first thing
Save Iulia's life
Discover Underworld icons Sisyphus, Tantalus, Ixion and the Belide
Discover what lies beneath the city
Loop through time once
Learn the true identity of the stranger by the river
Save Fabia's life
Enter a villa with a daring leap
Pick up the sponge on a stick
Get rejected by Aurelia
Use Photo Mode