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