Here is the full list of all 15 The Last Express Gold Edition achievements.
Arrive in Constantinople
If you like her, don't be shy
Read August's secret correspondence
"Borrow" Kronos's briefcase
Read Kronos's private papers
Find a souvenir of Tatiana's happier days
Read a young lady's intimate journal
Catch a beetle in the smoking car
You can't stay awake forever
Tyler's ready to leave the train
Meet Milos in your compartment
Find a quiet place for Tyler to rest
Find someone's stash of racy postcards
Experience all the "losing" endings of the game
Get off with the gold in Vienna