| Achievement | How to unlock | Points
|
|---|
| Astro-Not! (secret) | Complete Galaxy B | 50
|
| Breaking the Law. Of Physics. (secret) | Complete Galaxy D | 50
|
| Forced into Space for Unknown Reasons (secret) | Finish all levels in Galaxy A | 50
|
| Galactic Bulge (secret) | Earn a 3 star rating on all levels in Galaxy D | 100
|
| My Mellow-Harshing, Amigo (secret) | Hear all insults | 100
|
| Not Saying It Was Aliens, But It Was Aliens (secret) | Complete Galaxy C | 50
|
| Quasi-Stellar Object (secret) | Earn a 3 star rating on all levels in Galaxy B | 100
|
| Slow Clap. In Space. (secret) | Earn a 3 star rating on all levels in Galaxy A | 100
|
| Star Rats Spelled Backwards is Star Rats (secret) | View the ending | 100
|
| This is the End. (secret) | View the true ending | 200
|
| Your Anus. Erm, Uranus. (secret) | Earn a 3 star rating on all levels in Galaxy C | 100
|