Here is the full list of all 37 NOBUNAGA'S AMBITION: Taishi achievements.
Proof that all agriculture commands have been used.
Proof the scenario
Proof that you held 5 trading regions at the same time.
Proof a 100,000 gold income was achieved.
Proof Force population reached 1 million.
Proof that all disasters have been experienced.
Proof a base was upgraded to its maximum.
Proof of carrying out 30 policies.
Proof that each of the various policies has been used: agriculture, commerce, military, and debate.
Proof of an alliance formed.
Proof of victory in battle with none of your units retreating.
Proof that all commerce commands have been used.
Proof all records of "NOBUNAGA'S AMBITION: Taishi" were cleared.
Proof Daimyo received wife through a marriage alliance.
Proof of victory in a historical battle.
Proof of victory in a battle on sea or lake.
Proof of victory in a battle as part of a coalition.
Proof of the building of a new castle.
Proof that all diplomacy commands have been used.
Proof of victory in battle with an opponent who has more than double the troops.
Proof that 10 deeds have been recorded.
Proof of victory in 50 major battles.
Proof 20 types of strategy have been carried out.
Proof the resolution traits for 5 Daimyo were all unlocked.
Proof game was cleared by destroying all Daimyo clans.
Proof of developing a new facility (Power Up Kit Only).
Proof of winning a battle using a trap or military facility (Power Up Kit Only).
Proof of upgrading a castle (Power Up Kit Only).
Proof of concluding a Lord negotiation (Power Up Kit Only).
Proof of using a Colossal Order (Power Up Kit Only).
Proof of ordering 10 officers to betray in a single play (Power Up Kit Only).
Proof game was cleared in scenario "Siege of Odawara," "The Battle of Sekigahara," and "Siege of Osaka" (Power Up Kit Only).