Here is the full list of all 28 Relics of the Lost Age achievements.
Solve a tricky puzzle with no help from your companions.
Survive your first adventure with full health.
Find and decipher a message from long ago.
Leave nobody behind in Tibet.
Feed the wildlife in Bayou Lacombe.
Think like an ace attorney.
Take control of an old acquaintance.
Assassinate a jungle tyrant in person.
Prove yourself on the field of battle.
Do as much damage as possible inside the British Museum.
Do as little damage as possible inside the British Museum.
Find the Black Gallery on your first attempt.
Go large at the Lotus Blossom.
Save a troubled ally from his own worst instincts.
Tell them everything!
Tell them nothing!
Find and quote a line from a classic adventure game.
Find and quote three iconic lines from a certain classic movie franchise.
Find and quote five iconic lines from a certain classic movie franchise.
Had a dramatic reunion with a deceased spy.
Successfully romance a passionate archaeologist.
Successfully romance a fearless explorer.
Successfully romance a deposed royal.
Successfully romance a tormented soul.
Successfully romance more than one partner.
Bed everyone who can be bedded.
Sent Eschatos and its deadly contents to the bottom of the South China Sea.
Handed over Eschatos and its secrets to British Intelligence.