Here is the full list of all 26 Ninja Senki DX achievements.
Get the worst ending.
Defeat 100 Kage before defeating a Monban.
Complete all "Perfect" challenges.
Clear the game as the Ronin.
Clear the game without dying in "Hardcore" mode.
Defeat 2500 enemies.
Complete all "Collector" challenges.
Complete all "Speed Runner" challenges.
Get a score over 17500 pts. in "Hardcore" mode.
Get the best ending in "Hardcore" mode.
Complete all "Assassin" challenges.
Accumulate 9 lives.
Clear the game in 25 minutes or less in "Hardcore" mode.
Get the 2nd best ending.
Clear the game in "Hardcore" mode.
Clear the game without continuing in "Hardcore" mode.
Clear scene 7 without defeating any kunoichi.
Complete a "Perfect", a "Assassin", a "Collector" and a "Speed Runner" challenge all at once.
Obtain a gold medal in "Boss Rush" mode.
Defeat Shiro in 25 seconds or less.
Defeat Shiro without getting hit.
Defeat Yurei in 40 seconds or less.
Defeat Tanuki in 10 seconds or less.
Get the best ending.
Defeat a Monban in 10 seconds or less.
Defeat Ryu in 30 seconds or less.