Here is the full list of all 30 Save the Ninja Clan achievements.
Kill 25 enemies.
Explode 50 times
Die 100 times.
Beat the first boss.
Beat a level with an A+ time.
Die 50 times.
Attempt a level 25 times.
Attempt a level 10 times.
Beat the first level
Kill yourself with your own weapon.
Beat level 4 with controls reversed.
Beat 5 levels without dying.
Beat 10 levels without dying.
Beat the second boss.
Beat the third boss.
Complete one secret.
Complete 10 secrets.
Unlock something.
Kill 50 enemies.
Find and complete the secret ending.
Complete all the levels.
Collect 15 Collectables.
Fall for it on level two.
Level 11, go to "prison".
Level 19, crash the game.
Beat half the levels.
Play Pong in the game.
Level 29, play as a scroll.
Level 25, ride a cloud.
Level 9, see a smiley face.