Here is the full list of all 60 Expeditions: Conquistador achievements.
Experience a mutiny
Start the game with only women, as a female character
Return to Spain without losing any expedition members
Complete the game on Normal difficulty
Turn against your allies in their hour of triumph
Kill Moctezuma Xocoyotzin
Unlock all the Codex entries
Save Moctezuma Xocoyotzin
Kick off the battle for Tenochtitlan
Form a romantic relationship
Discover El Dorado
Find all the cairns and compile all the maps of Mexico
Discover the Masaya Volcano tunnels
Aid the escaped slaves
Revive an incapacitated unit and keep that unit alive until the end of the battle
Recruit all 6 native followers in Mexico in a single playthrough
Restore Fortaleza De Gutiérrez to its full glory
Deal more than 100 points of damage with a single attack
Kill an enemy unit with a cannon blast
Capture Xochiyohua
Enter combat with six units at Veteran or higher rank
Inadvertently unleash smallpox on the population of Tenochtitlan
Sacrifice a member of your expedition
Discover Tenochtitlan
Promote a follower to Lieutenant
Kill an enemy with an Interrupt attack
Hit one of your own units with AoE damage
Complete The Temple of Death
Rebuild Fortaleza De Gutiérrez
Discover the Fountain Of Youth
Recruit Anacaona for your expedition
Achieve a Flawless Victory in an Escape battle
Win a non-tutorial battle with only Scholars and Doctors
Marry a native
Enter combat with at least 25 points of Equipment assigned to a single unit
Cast off for the mainland!
Achieve fifteen Flawless Victories in a row on Normal or greater difficulty
Save Governor Bernardo De Manzanedo
Find all cairns on Hispaniola and compile all the maps of the island
Kick an enemy into a burning or trapped space
Complete 5 side quests in Hispaniola
Attack and destroy a native settlement on Hispaniola
Complete The Gloaming
Win all three battles in the Tournament
Score a hit with a ranged attack with a 5% hit chance
Nurse a Fatally Injured expedition member back to full health
Make camp without giving any of your followers food
Defeat Esteban Gallego
Resolve the Jungle Drums goal without bloodshed
Have all your followers be disabled at the same time
Kill an enemy with a flanking strike
Recruit Isabela de Yruenes for your expedition
Lose the first tutorial battle
Win a non-tutorial battle without ever getting within melee distance of an enemy
Complete the game on Hard difficulty
Complete the game on Insane difficulty
Complete the game in Iron Man mode on any difficulty
Return to Spain with 50,000 Valuables or more
Fully research all the possible inventions and construct one item of every possible recipe
Trade at every market in both campaigns in a single playthrough