Here is a list of all objective. this list is not complete at present. we will update it later.
Raid on the Imagawa
The Battle Begins
Defeat the Enemy Troops
Heihachiro’s Brave Fight
Defeat Tadakatsu Honda (Be careful on hard)
Imagawa Reinforcements
Defeat Motonobu Okabe and Yasuyoshi Asishina
Ninja and the Noblewoman
Defeat Sena and Hanzo Hattori to prevent Nobuyuki Oda and Katsuie Shibata from being taken out
Mikawa Wavers
Defeat Hirotada Matsudaira and Masanari Naito
Assault on Mino
Gaining a Foothold
Defeat Michikatsu Inoue to capture the Central Garrison
The Foolish and the Stubborn
Defeat Mitsuhide Akechi
The Viper’s Trap
Defeat Toshimitsu Saito to defend the Oda Main Camp
We Three of Mino
Defeat Ittetsu Inaba, Morinari Ando, and Bokuzen Ujiie
The Young Strategist
Defeat Hanbei Takenaka
Echoes on the Battlefield
Defeat Mitsuhara Fuwa and the Drum corps
Rematch
Defeat Mitsuhide Akechi
Nobuyuki’s Struggle
Defeat Michitoshi Nagai and the spear captains
Yoshitatsu the Opportunist
Prevent Yoshitatsu Saito from infiltrating the Oda Main Camp
Thanks to bruticus0 for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.