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