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