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