Here is the full list of all 30 Save the Ninja Clan achievements.
Kill 50 enemies.
Kill 25 enemies.
Level 11, go to "prison".
Die 100 times.
Attempt a level 25 times.
Explode 50 times
Unlock something.
Level 9, see a smiley face.
Beat the first boss.
Die 50 times.
Kill yourself with your own weapon.
Beat a level with an A+ time.
Fall for it on level two.
Attempt a level 10 times.
Complete one secret.
Beat the first level
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 10 secrets.
Find and complete the secret ending.
Complete all the levels.
Collect 15 Collectables.
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.