Item description:

Note it's for japanese version of the game, but I suspect it'll work just as well on US version when it's out on 16th July.

Now the trophies, and my notes on how to obtain them. I could be wrong on exact details, sorry.

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A Collector of Rarities - Obtained all of the Camp Symbols.
Enter Ambition Mode and check out Camp Symbols for trophy. Or you need to fight some Ambition Mode battles until you get a camp symbol.

A Majestic Manner - Reached the maximum Fame level in Ambition Mode.
Enter ambition and it should pop. Or fight one ambition battle for some fame.

A Shout of Triumph - Finished all of the stages within Story Mode and Free Mode with the exception of the tutorial.
Complete any story or free mode battle with anybody on any difficulty.

An Intricate Tale - Completed all of the stages in Story Mode.
Complete any stage in story mode on any difficulty.

Animal Collector - Obtained all of the animals within the game.
Enter ambition and check out animals entry. Or fight ambition battles until you pick up an item box with "Animal" popping up after collected.

Battle-hardened Veteran - Won 100 battles with the same officer.
Choose Lu Bu and win any battle.

Comeback Kid - Defeated 3 enemy officers with a Switch Counter in a single battle.
Enter any battle on Easy with two different weapons and look for officers with red "!" triangle above their head. Wait for such officer to charge up his/her attack (blue aura surrounds his/her weapon), and press R1 to switch weapons. If timed correctly, your officer will perform a counter attack.

Death from Above - Defeated an enemy after juggling them in the air for at least 10 seconds.
This one is a bit hard. You can try equip two War Fans (Zhuge Liang's Ex weapon). Play Wei's first stage on hard, lure a generic enemy officer to corner, and keep using weapon switch until he dies. It helps to reset the level of your officer to lv1 so he/she doesn't kill the officer you're juggling.

Event Collector - Unlocked all of the event scenes within the game.
Go to gallery and view any event.

Facility Construction - Had a new facility built in Ambition Mode.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions, but I know for a fact I didn't do anything in ambition but check menus and fight ambition battles.

Facility Expansion - Had a facility expanded in Ambition Mode.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions, but I know for a fact I didn't do anything in ambition but check menus and fight ambition battles.

Friends to the End - Formed a bond at the maximum level with another officer.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions. Or choose any officer as your bodyguard and keep fighting ambition battles until his/her bond becomes at maximum level.

Graduation Day - Complete one of the four tutorials.
Completed the tutorials for all of the kingdoms.

Heaven and Earth - Built a Tongquetai and welcomed the Emperor to your town.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions, but I know for a fact I didn't do anything in ambition but check menus and fight ambition battles.

In an Instant - Defeated 3 enemy officers with a Storm Rush in a single battle.
Enter any battle on Hard or Chaos with two different weapons and look for officers with blue shield icon above their head. Continuously attack such an officer to deplete his/her shield icon. With the icon depleted, your officer will enter a series of quick attacks. Kill three officers in this way in a single battle and voila.

King of the Combos - Achieved a 1,000 hit combo.
Enter any battle and mow down enemies until you have 1000 hit combo. Wang Yuanji's Ex weapon is IMO the easiest way to achieve it.

Legend of Jin (secret) - Viewed the ending (Historical & Hypothetical) for the Jin story.
Complete either of Jin dynasty last stages and view the ending credits.

Legend of Shu (secret) -Viewed the ending (Historical & Hypothetical) for the Shu story.
Complete either of Shu dynasty last stages and view the ending credits.

Legend of Wei (secret) - Viewed the ending (Historical & Hypothetical) for the Wei story.
Complete either of Wei dynasty last stages and view the ending credits.

Legend of Wu (secret) - Viewed the ending (Historical & Hypothetical) for the Wu story.
Complete either of Wu dynasty last stages and view the ending credits.

Like a Shadow - Finished any stage of the game, except for the tutorial, without taking any damage.
Self-explanatory.

Master of Chaos - Completed all of the stages on the "Chaos" difficulty level.
Complete any stage with any officer on Chaos and bam. With weapons provided you won't have a prob.

Mounted Terror - Defeated 1,000 enemies while mounted on a riding-type animal.
Self-explanatory. I think it'll pop after mounting your horse and killing first enemy you come across. If not, you'll have to do it the hard way.

Movie Collector - Unlocked all of the movies within the game.
Enter gallery and check out Movie sub-entry.

One Warrior vs. a Thousand - Defeated 1,000 enemies in a single battle.
Self-explanatory.

Revelation - Upgraded all skills to Level 10 or higher.
I think you need to check skills menu when equipping an officer.

The Beastmaster Awakens - Defeated 100 enemies with a companion-type animal.
Play Yellow Turban Rebellion on Zhang Jiao's side on lowest difficulty. Choose the tiger as your companion animal. Head north when the stage starts and there will be a lot of enemies there. Run away from your tiger and while following you it'll hit a lot of enemies. Repeat this until you get the trophy.

The Birth of a Leader - Fought 5 straight battles in Ambition Mode.
Enter ambition and fight ambition battles consecutively until trophy pops. I recommend ambition battles with a GREEN word in description - those are battles for weapon/building materials and very short. You can complete one such battle in less than a minute.

The Destroyer - Destroyed a total of 1,000 siege weapons.
Enter any battle with siege weapons and destroy one of them for the trophy.

The Height of Prosperity - Obtained all of the facilities in Ambition Mode.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions, but I know for a fact I didn't do anything in ambition but check menus and fight ambition battles.

The Land of Plenty - Obtained more than 1,000 materials for weapons and facilities in Ambition Mode.
Enter ambition and fight ambition battles with a GREEN word in description. Destroy a pot/crate/other destructibles and pick up the item box. Very likely it'll have "Material" appear above it, and you'll get the trophy.

The Path of Ambition - Fought 20 straight battles in Ambition Mode.
Enter ambition and fight ambition battles consecutively until trophy pops. I recommend ambition battles with a GREEN word in description - those are battles for weapon/building materials and very short. You can complete one such battle in less than a minute.

The Ties that Bind Us - Became allies with all of the officers in Ambition Mode.
Enter ambition and it should pop after checking various menus. I apologize for not having exact directions, but I know for a fact I didn't do anything in ambition but check menus and fight ambition battles.

True Rage - Used a True Rage Attack.
Build up your rage meter, and press R3 to activate rage mode. During rage mode, press and hold Circle for True Rage attack.

True Warrior of the 3 Kingdoms - Obtained all trophies.
Get all other trophies.

Unstoppable Might (secret) - Defeated a total of more than 100,000 enemies.
Kill any enemy in any stage with any officer for the trophy.

Untold Legends (secret) - Completed all of the stages for the Other story.
Complete any stage for "Other" on any difficulty.

Unwavering Ambition - Fought 50 straight battles in Ambition Mode.
Enter ambition and fight ambition battles consecutively until trophy pops. I recommend ambition battles with a GREEN word in description - those are battles for weapon/building materials and very short. You can complete one such battle in less than a minute.

Vocal Enthusiast - Listened to all of the voice lines within the Gallery.
Enter gallery and check out the voice lines.

Wallpaper Collector - Unlocked all of the wallpapers within the game.
Enter gallery and check out the wallpapers.

Weapon Collector - Obtained all of the weapons in the game.
Enter gallery and check out the weapons.
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Well, that would be all. Again, I'm sorry that I don't have exact details for some of the trophies. So, I'd appreciate feedback from others who use the save to report back on what is the exact way to collect the trophy.