Here is the full list of all 31 STRIKERS 1945 II achievements.
Defeat special tank Block Ade
Defeat Gigantic Submarine Cross Sinker
Used the maximum guage attack Lv 3
Increased life
Defeat the huge cannon fortress Rommel
Obtain a total of 50 gold bar
Defeat Super Carrier Graf Zeppelin
Strenghtened aircraft shot fully
Defeat the Huge Flying Boat Syumi Type 0
Defeat Armored Train Gliath
Defeat Battle Air Ship Iron Casket
Watch the ending with P-38 Lightning
Watch the ending with F5U Flying Pancake
Watch the ending with Focke-WulfTa152
Watch the ending with Ki-84 Hayate
Watch the ending with J7W Shinden
Watch the ending with DH-98 Mosquito
Defeat biological weapon F, G, R
Player evaluation, eligible become a pilot
Player evaluation, super talented pilot
Player evaluation, already transcendence the god
Watch the ending without continuing in MONKEY Mode
Watch the ending without continuing in CHILD Mode
Watch the ending without continuing in VERY EASY Mode
Watch the ending without continuing in EASY Mode
Watch the ending without continuing in NORMAL Mode
Watch the ending without continuing in HARD Mode
Watch the ending without continuing in VERY HARD Mode
Collect maximum quantity of bomb (default setting)
Clear the game without destroying any enemies
Achieve all achievements