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