Here is the full list of all 30 Save the Ninja Clan achievements.
Beat a level with an A+ time.
Level 9, see a smiley face.
Kill 50 enemies.
Beat half the levels.
Attempt a level 25 times.
Die 100 times.
Explode 50 times
Kill 25 enemies.
Level 11, go to "prison".
Unlock something.
Beat the first boss.
Die 50 times.
Complete one secret.
Attempt a level 10 times.
Fall for it on level two.
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 10 secrets.
Find and complete the secret ending.
Complete all the levels.
Collect 15 Collectables.
Level 19, crash the game.
Play Pong in the game.
Level 29, play as a scroll.
Level 25, ride a cloud.