Here is the full list of all 106 Total War: SHOGUN 2 achievements.
Win a campaign as the Mori clan.
Complete the Battle of Hakodate without any Imperial units being routed. [Fall of the Samurai only]
Complete all historical battles. [Fall of the Samurai only]
Complete the Battle of Miyako Bay with the Kotetsu having taken less than 25% damage. [Fall of the Samurai only]
Win the Battle of Aizu after provoking all four hidden armies at once. [Fall of the Samurai only]
Win the Battle of Ueno without capturing any of the key temple buildings. [Fall of the Samurai only]
Win the Battle of Osaka after both bridges get blown up by the defenders. [Fall of the Samurai only]
Playing as the Aizu, carry out 3 successful assassinations of generals in the same campaign using a shinsengumi. [Fall of the Samurai only]
Win a campaign on very hard difficulty.
Win a campaign on legendary difficulty.
Win a campaign on legendary difficulty playing as either the Satsuma, the Tosa or the Choshu. [Fall of the Samurai only]
Sink an enemy ship by ramming. [Fall of the Samurai only]
Sink an enemy ship with torpedoes. [Fall of the Samurai only]
Playing as the Tosa, carry out 5 naval bombardments in the same campaign. [Fall of the Samurai only]
Playing as the Satsuma, construct a trade district and trade with a foreign power within the same campaign. [Fall of the Samurai only]
Win 25 matchmade battles in multiplayer.
Win a campaign as a Christian daimyo.
Win a campaign on hard difficulty.
Playing as the Nagaoka, research any eighth tier technology. [Fall of the Samurai only]
Win a campaign as the Uesugi clan.
Wipe out the Ikko-Ikki in the campaign.
As the attacker, burn a castle's gates, towers and tenshu to the ground using fire arrows and win the battle.
Capture 15 provinces on the avatar campaign map.
Win a multiplayer battle where more than 50% of your army is made up of matchlock units.
Call in naval fire support during a land battle. [Fall of the Samurai only]
Playing as the Choshu, incite 3 rebellions in the same campaign using an ishin shishi. [Fall of the Samurai only]
Win a defensive siege battle with your daimyo during any winter turn.
Personally earn 20 clan tokens.
Chase down and rout an enemy unit as it tries to escape the Battle of Toba-Fushimi. [Fall of the Samurai only]
Obtain a maximum level monk.
Win a battle with British ships in your navy. [Fall of the Samurai only]
Construct a railway between 2 provinces. [Fall of the Samurai only]
Your clan holds 5 provinces simultaneously on the multiplayer clan campaign map.
Be the first clan in the campaign to master the art of Shih.
Win a campaign as the Shimazu clan.
Attain the maximum level of clan development. [Fall of the Samurai only]
Win a campaign as the Chosokabe clan.
Win a campaign on normal difficulty.
Control all the provinces on the island of Kyushu in the campaign.
Your daimyo wins 3 consecutive land battles during the summer season.
Obtain a maximum level missionary.
Win a campaign as the Oda clan.
Win a campaign on easy difficulty.
Achieve the ultimate goal and become Shogun in the grand campaign.
Obtain a unit of maximum rank in the grand campaign.
Obtain 100 fame within 50 turns.
Wipe out the Hattori clan in the campaign.
Win a defensive siege battle with the lady of the house, the Onna Bushi, as your general. (Single Player Only)
Be the first clan in the campaign to obtain gunpowder mastery.
As the defender, recapture a tower.
Be the first clan in the campaign to master the art of epic architecture.
Collect 10,000 heads of enemy soldiers.
Control all the trade posts on the campaign map at the same time.
Obtain a maximum level metsuke.
Obtain a maximum level ninja in the campaign.
Obtain a maximum level general in the campaign.
Join a multiplayer clan in Shogun 2.
Create a second avatar for use in avatar conquest mode.
Through the avatar system, get a veteran unit to level 4.
Defeat a Shogun 2 army with a Fall of the Samurai army. [Fall of the Samurai only]
Successfully rally 5 units at once with one use of the general's rally ability.
Win 25 land battles.
Win a battle with United States Marines in your army. [Fall of the Samurai only]
Win a battle using an army composed entirely of hero units and your general.
Play a historical battle. [Fall of the Samurai only]
Control all the provinces on the island of Shikoku in the campaign.
Have all your army, except the general, hidden simultaneously for more than 30 seconds.
Completely wipe out an enemy unit.
Play 10 multiplayer battles of any type.
Win a multiplayer battle using no cavalry units (excluding the general) in your army.
Win a multiplayer battle using no ranged units in your army.
Win a multiplayer battle using no spear units in your army.
Win a battle using an army composed of at least one of every class of unit (sword infantry, cavalry, archer, matchlock, spear, naginata).
Defeat a Creative Assembly staff member in battle, or anyone else who has gained this achievement.
On maps with more than one key building, your alliance shows its dominance by holding all of them simultaneously.
Defeat a Fall of the Samurai army with a Shogun 2 army.
Keep at least 4 ashigaru units for a whole battle without routing once.
Win your first multiplayer battle.
Win a multiplayer battle losing less than 15% of your starting troops.
Capture all provinces on the avatar campaign map.
Spend the maximum number of points in your avatar's skill tree.
Through the avatar system, get a veteran unit to level 9.
Win 10 siege battles as the attacker.
Win 10 siege battles as the defender.
Win 100 matchmade battles in multiplayer.
Win 20 naval battles in multiplayer.
Win 50 matchmade battles in multiplayer.
Win 200 multiplayer battles of any type.
Sink a nanban trade ship or the flagship vessel the Nihon Maru during a naval battle.
Win a campaign as the Hojo clan.
Win a campaign as the Takeda clan.
Win a campaign as the Tokugawa clan.
Win a campaign as the Date clan.
Win a multiplayer co-op campaign.
Win a multiplayer head to head campaign.
Achieve the ultimate accolade and obtain rank 1 on the multiplayer Shogun Ladder.
Max out any [Fall of the Samurai] avatar skill tree, by spending a skill point in each skill within a single skill tree.
Gift your co-op partner an army or navy.
Playing as the Jozai, win 3 ambush battles in the same campaign. [Fall of the Samurai only]
Carry out a bombardment with a French ironclad in your navy. [Fall of the Samurai only]
Obtain a maximum level agent of each type. [Fall of the Samurai only]
Win a campaign on legendary difficulty playing as either the Aizu, the Jozai or the Nagaoka. [Fall of the Samurai only]
Fight a drop-in battle.
Sink an HMS Warrior-class ship. [Fall of the Samurai only]
Win a multiplayer head to head campaign despite giving the other player 10,000 koku.
Declare your independence and complete a campaign. [Fall of the Samurai only]